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 2004-2015 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         struct berval mt_dn;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* All the info of a psearch result that's shared between
  49  * multiple queues
  50  */
  51 typedef struct resinfo {
  52         struct syncres *ri_list;
  53         Entry *ri_e;
  54         struct berval ri_dn;
  55         struct berval ri_ndn;
  56         struct berval ri_uuid;
  57         struct berval ri_csn;
  58         struct berval ri_cookie;
  59         char ri_isref;
  60         ldap_pvt_thread_mutex_t ri_mutex;
  61 } resinfo;
  62
  63 /* A queued result of a persistent search */
  64 typedef struct syncres {
  65         struct syncres *s_next; /* list of results on this psearch queue */
  66         struct syncres *s_rilist;       /* list of psearches using this result */
  67         resinfo *s_info;
  68         char s_mode;
  69 } syncres;
  70
  71 /* Record of a persistent search */
  72 typedef struct syncops {
  73         struct syncops *s_next;
  74         struct syncprov_info_t *s_si;
  75         struct berval   s_base;         /* ndn of search base */
  76         ID              s_eid;          /* entryID of search base */
  77         Operation       *s_op;          /* search op */
  78         int             s_rid;
  79         int             s_sid;
  80         struct berval s_filterstr;
  81         int             s_flags;        /* search status */
  82 #define PS_IS_REFRESHING        0x01
  83 #define PS_IS_DETACHED          0x02
  84 #define PS_WROTE_BASE           0x04
  85 #define PS_FIND_BASE            0x08
  86 #define PS_FIX_FILTER           0x10
  87 #define PS_TASK_QUEUED          0x20
  88
  89         int             s_inuse;        /* reference count */
  90         struct syncres *s_res;
  91         struct syncres *s_restail;
  92         ldap_pvt_thread_mutex_t s_mutex;
  93 } syncops;
  94
  95 /* A received sync control */
  96 typedef struct sync_control {
  97         struct sync_cookie sr_state;
  98         int sr_rhint;
  99 } sync_control;
 100
 101 #if 0 /* moved back to slap.h */
 102 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
 103 #endif
 104 /* o_sync_mode uses data bits of o_sync */
 105 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
 106
 107 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
 108 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
 109 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
 110 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
 111
 112 /* Record of which searches matched at premodify step */
 113 typedef struct syncmatches {
 114         struct syncmatches *sm_next;
 115         syncops *sm_op;
 116 } syncmatches;
 117
 118 /* Session log data */
 119 typedef struct slog_entry {
 120         struct slog_entry *se_next;
 121         struct berval se_uuid;
 122         struct berval se_csn;
 123         int     se_sid;
 124         ber_tag_t       se_tag;
 125 } slog_entry;
 126
 127 typedef struct sessionlog {
 128         BerVarray       sl_mincsn;
 129         int             *sl_sids;
 130         int             sl_numcsns;
 131         int             sl_num;
 132         int             sl_size;
 133         slog_entry *sl_head;
 134         slog_entry *sl_tail;
 135         ldap_pvt_thread_mutex_t sl_mutex;
 136 } sessionlog;
 137
 138 /* The main state for this overlay */
 139 typedef struct syncprov_info_t {
 140         syncops         *si_ops;
 141         struct berval   si_contextdn;
 142         BerVarray       si_ctxcsn;      /* ldapsync context */
 143         int             *si_sids;
 144         int             si_numcsns;
 145         int             si_chkops;      /* checkpointing info */
 146         int             si_chktime;
 147         int             si_numops;      /* number of ops since last checkpoint */
 148         int             si_nopres;      /* Skip present phase */
 149         int             si_usehint;     /* use reload hint */
 150         int             si_active;      /* True if there are active mods */
 151         int             si_dirty;       /* True if the context is dirty, i.e changes
 152                                                  * have been made without updating the csn. */
 153         time_t  si_chklast;     /* time of last checkpoint */
 154         Avlnode *si_mods;       /* entries being modified */
 155         sessionlog      *si_logs;
 156         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 157         ldap_pvt_thread_mutex_t si_ops_mutex;
 158         ldap_pvt_thread_mutex_t si_mods_mutex;
 159         ldap_pvt_thread_mutex_t si_resp_mutex;
 160 } syncprov_info_t;
 161
 162 typedef struct opcookie {
 163         slap_overinst *son;
 164         syncmatches *smatches;
 165         modtarget *smt;
 166         Entry *se;
 167         struct berval sdn;      /* DN of entry, for deletes */
 168         struct berval sndn;
 169         struct berval suuid;    /* UUID of entry */
 170         struct berval sctxcsn;
 171         short osid;     /* sid of op csn */
 172         short rsid;     /* sid of relay */
 173         short sreference;       /* Is the entry a reference? */
 174         syncres ssres;
 175 } opcookie;
 176
 177 typedef struct fbase_cookie {
 178         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 179         syncops *fss;   /* persistent search we're testing against */
 180         int fbase;      /* if TRUE we found the search base and it's still valid */
 181         int fscope;     /* if TRUE then fdn is within the psearch scope */
 182 } fbase_cookie;
 183
 184 static AttributeName csn_anlist[3];
 185 static AttributeName uuid_anlist[2];
 186
 187 /* Build a LDAPsync intermediate state control */
 188 static int
 189 syncprov_state_ctrl(
 190         Operation       *op,
 191         SlapReply       *rs,
 192         Entry           *e,
 193         int             entry_sync_state,
 194         LDAPControl     **ctrls,
 195         int             num_ctrls,
 196         int             send_cookie,
 197         struct berval   *cookie )
 198 {
 199         Attribute* a;
 200         int ret;
 201
 202         BerElementBuffer berbuf;
 203         BerElement *ber = (BerElement *)&berbuf;
 204         LDAPControl *cp;
 205         struct berval bv;
 206         struct berval   entryuuid_bv = BER_BVNULL;
 207
 208         ber_init2( ber, 0, LBER_USE_DER );
 209         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 210
 211         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 212                 AttributeDescription *desc = a->a_desc;
 213                 if ( desc == slap_schema.si_ad_entryUUID ) {
 214                         entryuuid_bv = a->a_nvals[0];
 215                         break;
 216                 }
 217         }
 218
 219         /* FIXME: what if entryuuid is NULL or empty ? */
 220
 221         if ( send_cookie && cookie ) {
 222                 ber_printf( ber, "{eOON}",
 223                         entry_sync_state, &entryuuid_bv, cookie );
 224         } else {
 225                 ber_printf( ber, "{eON}",
 226                         entry_sync_state, &entryuuid_bv );
 227         }
 228
 229         ret = ber_flatten2( ber, &bv, 0 );
 230         if ( ret == 0 ) {
 231                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 232                 cp->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 233                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 234                 cp->ldctl_value.bv_val = (char *)&cp[1];
 235                 cp->ldctl_value.bv_len = bv.bv_len;
 236                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 237                 ctrls[num_ctrls] = cp;
 238         }
 239         ber_free_buf( ber );
 240
 241         if ( ret < 0 ) {
 242                 Debug( LDAP_DEBUG_TRACE,
 243                         "slap_build_sync_ctrl: ber_flatten2 failed (%d)\n",
 244                         ret, 0, 0 );
 245                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 246                 return LDAP_OTHER;
 247         }
 248
 249         return LDAP_SUCCESS;
 250 }
 251
 252 /* Build a LDAPsync final state control */
 253 static int
 254 syncprov_done_ctrl(
 255         Operation       *op,
 256         SlapReply       *rs,
 257         LDAPControl     **ctrls,
 258         int                     num_ctrls,
 259         int                     send_cookie,
 260         struct berval *cookie,
 261         int                     refreshDeletes )
 262 {
 263         int ret;
 264         BerElementBuffer berbuf;
 265         BerElement *ber = (BerElement *)&berbuf;
 266         LDAPControl *cp;
 267         struct berval bv;
 268
 269         ber_init2( ber, NULL, LBER_USE_DER );
 270         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 271
 272         ber_printf( ber, "{" );
 273         if ( send_cookie && cookie ) {
 274                 ber_printf( ber, "O", cookie );
 275         }
 276         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 277                 ber_printf( ber, "b", refreshDeletes );
 278         }
 279         ber_printf( ber, "N}" );
 280
 281         ret = ber_flatten2( ber, &bv, 0 );
 282         if ( ret == 0 ) {
 283                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 284                 cp->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 285                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 286                 cp->ldctl_value.bv_val = (char *)&cp[1];
 287                 cp->ldctl_value.bv_len = bv.bv_len;
 288                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 289                 ctrls[num_ctrls] = cp;
 290         }
 291
 292         ber_free_buf( ber );
 293
 294         if ( ret < 0 ) {
 295                 Debug( LDAP_DEBUG_TRACE,
 296                         "syncprov_done_ctrl: ber_flatten2 failed (%d)\n",
 297                         ret, 0, 0 );
 298                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 299                 return LDAP_OTHER;
 300         }
 301
 302         return LDAP_SUCCESS;
 303 }
 304
 305 static int
 306 syncprov_sendinfo(
 307         Operation       *op,
 308         SlapReply       *rs,
 309         int                     type,
 310         struct berval *cookie,
 311         int                     refreshDone,
 312         BerVarray       syncUUIDs,
 313         int                     refreshDeletes )
 314 {
 315         BerElementBuffer berbuf;
 316         BerElement *ber = (BerElement *)&berbuf;
 317         struct berval rspdata;
 318
 319         int ret;
 320
 321         ber_init2( ber, NULL, LBER_USE_DER );
 322         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 323
 324         if ( type ) {
 325                 switch ( type ) {
 326                 case LDAP_TAG_SYNC_NEW_COOKIE:
 327                         ber_printf( ber, "tO", type, cookie );
 328                         break;
 329                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 330                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 331                         ber_printf( ber, "t{", type );
 332                         if ( cookie ) {
 333                                 ber_printf( ber, "O", cookie );
 334                         }
 335                         if ( refreshDone == 0 ) {
 336                                 ber_printf( ber, "b", refreshDone );
 337                         }
 338                         ber_printf( ber, "N}" );
 339                         break;
 340                 case LDAP_TAG_SYNC_ID_SET:
 341                         ber_printf( ber, "t{", type );
 342                         if ( cookie ) {
 343                                 ber_printf( ber, "O", cookie );
 344                         }
 345                         if ( refreshDeletes == 1 ) {
 346                                 ber_printf( ber, "b", refreshDeletes );
 347                         }
 348                         ber_printf( ber, "[W]", syncUUIDs );
 349                         ber_printf( ber, "N}" );
 350                         break;
 351                 default:
 352                         Debug( LDAP_DEBUG_TRACE,
 353                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 354                                 type, 0, 0 );
 355                         return LDAP_OTHER;
 356                 }
 357         }
 358
 359         ret = ber_flatten2( ber, &rspdata, 0 );
 360
 361         if ( ret < 0 ) {
 362                 Debug( LDAP_DEBUG_TRACE,
 363                         "syncprov_sendinfo: ber_flatten2 failed (%d)\n",
 364                         ret, 0, 0 );
 365                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 366                 return LDAP_OTHER;
 367         }
 368
 369         rs->sr_rspoid = LDAP_SYNC_INFO;
 370         rs->sr_rspdata = &rspdata;
 371         send_ldap_intermediate( op, rs );
 372         rs->sr_rspdata = NULL;
 373         ber_free_buf( ber );
 374
 375         return LDAP_SUCCESS;
 376 }
 377
 378 /* Find a modtarget in an AVL tree */
 379 static int
 380 sp_avl_cmp( const void *c1, const void *c2 )
 381 {
 382         const modtarget *m1, *m2;
 383         int rc;
 384
 385         m1 = c1; m2 = c2;
 386         rc = m1->mt_dn.bv_len - m2->mt_dn.bv_len;
 387
 388         if ( rc ) return rc;
 389         return ber_bvcmp( &m1->mt_dn, &m2->mt_dn );
 390 }
 391
 392 /* syncprov_findbase:
 393  *   finds the true DN of the base of a search (with alias dereferencing) and
 394  * checks to make sure the base entry doesn't get replaced with a different
 395  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 396  * change is detected, any persistent search on this base must be terminated /
 397  * reloaded.
 398  *   On the first call, we just save the DN and entryID. On subsequent calls
 399  * we compare the DN and entryID with the saved values.
 400  */
 401 static int
 402 findbase_cb( Operation *op, SlapReply *rs )
 403 {
 404         slap_callback *sc = op->o_callback;
 405
 406         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 407                 fbase_cookie *fc = sc->sc_private;
 408
 409                 /* If no entryID, we're looking for the first time.
 410                  * Just store whatever we got.
 411                  */
 412                 if ( fc->fss->s_eid == NOID ) {
 413                         fc->fbase = 2;
 414                         fc->fss->s_eid = rs->sr_entry->e_id;
 415                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 416
 417                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 418                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 419
 420                 /* OK, the DN is the same and the entryID is the same. */
 421                         fc->fbase = 1;
 422                 }
 423         }
 424         if ( rs->sr_err != LDAP_SUCCESS ) {
 425                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 426         }
 427         return LDAP_SUCCESS;
 428 }
 429
 430 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 431 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 432
 433 static int
 434 syncprov_findbase( Operation *op, fbase_cookie *fc )
 435 {
 436         /* Use basic parameters from syncrepl search, but use
 437          * current op's threadctx / tmpmemctx
 438          */
 439         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 440         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 441                 slap_callback cb = {0};
 442                 Operation fop;
 443                 SlapReply frs = { REP_RESULT };
 444                 int rc;
 445
 446                 fc->fss->s_flags ^= PS_FIND_BASE;
 447                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 448
 449                 fop = *fc->fss->s_op;
 450
 451                 fop.o_bd = fop.o_bd->bd_self;
 452                 fop.o_hdr = op->o_hdr;
 453                 fop.o_time = op->o_time;
 454                 fop.o_tincr = op->o_tincr;
 455                 fop.o_extra = op->o_extra;
 456
 457                 cb.sc_response = findbase_cb;
 458                 cb.sc_private = fc;
 459
 460                 fop.o_sync_mode = 0;    /* turn off sync mode */
 461                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 462                 fop.o_callback = &cb;
 463                 fop.o_tag = LDAP_REQ_SEARCH;
 464                 fop.ors_scope = LDAP_SCOPE_BASE;
 465                 fop.ors_limit = NULL;
 466                 fop.ors_slimit = 1;
 467                 fop.ors_tlimit = SLAP_NO_LIMIT;
 468                 fop.ors_attrs = slap_anlist_no_attrs;
 469                 fop.ors_attrsonly = 1;
 470                 fop.ors_filter = &generic_filter;
 471                 fop.ors_filterstr = generic_filterstr;
 472
 473                 rc = fop.o_bd->be_search( &fop, &frs );
 474         } else {
 475                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 476                 fc->fbase = 1;
 477         }
 478
 479         /* After the first call, see if the fdn resides in the scope */
 480         if ( fc->fbase == 1 ) {
 481                 switch ( fc->fss->s_op->ors_scope ) {
 482                 case LDAP_SCOPE_BASE:
 483                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 484                         break;
 485                 case LDAP_SCOPE_ONELEVEL: {
 486                         struct berval pdn;
 487                         dnParent( fc->fdn, &pdn );
 488                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 489                         break; }
 490                 case LDAP_SCOPE_SUBTREE:
 491                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 492                         break;
 493                 case LDAP_SCOPE_SUBORDINATE:
 494                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 495                                 !dn_match( fc->fdn, &fc->fss->s_base );
 496                         break;
 497                 }
 498         }
 499
 500         if ( fc->fbase )
 501                 return LDAP_SUCCESS;
 502
 503         /* If entryID has changed, then the base of this search has
 504          * changed. Invalidate the psearch.
 505          */
 506         return LDAP_NO_SUCH_OBJECT;
 507 }
 508
 509 /* syncprov_findcsn:
 510  *   This function has three different purposes, but they all use a search
 511  * that filters on entryCSN so they're combined here.
 512  * 1: at startup time, after a contextCSN has been read from the database,
 513  * we search for all entries with CSN >= contextCSN in case the contextCSN
 514  * was not checkpointed at the previous shutdown.
 515  *
 516  * 2: when the current contextCSN is known and we have a sync cookie, we search
 517  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 518  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 519  *
 520  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 521  * CSN, and generate Present records for them. We always collect this result
 522  * in SyncID sets, even if there's only one match.
 523  */
 524 typedef enum find_csn_t {
 525         FIND_MAXCSN     = 1,
 526         FIND_CSN        = 2,
 527         FIND_PRESENT    = 3
 528 } find_csn_t;
 529
 530 static int
 531 findmax_cb( Operation *op, SlapReply *rs )
 532 {
 533         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 534                 struct berval *maxcsn = op->o_callback->sc_private;
 535                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 536                         slap_schema.si_ad_entryCSN );
 537
 538                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 539                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 540                         maxcsn->bv_len = a->a_vals[0].bv_len;
 541                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 542                 }
 543         }
 544         return LDAP_SUCCESS;
 545 }
 546
 547 static int
 548 findcsn_cb( Operation *op, SlapReply *rs )
 549 {
 550         slap_callback *sc = op->o_callback;
 551
 552         /* We just want to know that at least one exists, so it's OK if
 553          * we exceed the unchecked limit.
 554          */
 555         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 556                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 557                 sc->sc_private = (void *)1;
 558         }
 559         return LDAP_SUCCESS;
 560 }
 561
 562 /* Build a list of entryUUIDs for sending in a SyncID set */
 563
 564 #define UUID_LEN        16
 565
 566 typedef struct fpres_cookie {
 567         int num;
 568         BerVarray uuids;
 569         char *last;
 570 } fpres_cookie;
 571
 572 static int
 573 findpres_cb( Operation *op, SlapReply *rs )
 574 {
 575         slap_callback *sc = op->o_callback;
 576         fpres_cookie *pc = sc->sc_private;
 577         Attribute *a;
 578         int ret = SLAP_CB_CONTINUE;
 579
 580         switch ( rs->sr_type ) {
 581         case REP_SEARCH:
 582                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 583                 if ( a ) {
 584                         pc->uuids[pc->num].bv_val = pc->last;
 585                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 586                                 pc->uuids[pc->num].bv_len );
 587                         pc->num++;
 588                         pc->last = pc->uuids[pc->num].bv_val;
 589                         pc->uuids[pc->num].bv_val = NULL;
 590                 }
 591                 ret = LDAP_SUCCESS;
 592                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 593                         break;
 594                 /* FALLTHRU */
 595         case REP_RESULT:
 596                 ret = rs->sr_err;
 597                 if ( pc->num ) {
 598                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 599                                 0, pc->uuids, 0 );
 600                         pc->uuids[pc->num].bv_val = pc->last;
 601                         pc->num = 0;
 602                         pc->last = pc->uuids[0].bv_val;
 603                 }
 604                 break;
 605         default:
 606                 break;
 607         }
 608         return ret;
 609 }
 610
 611 static int
 612 syncprov_findcsn( Operation *op, find_csn_t mode, struct berval *csn )
 613 {
 614         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 615         syncprov_info_t         *si = on->on_bi.bi_private;
 616
 617         slap_callback cb = {0};
 618         Operation fop;
 619         SlapReply frs = { REP_RESULT };
 620         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 621         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 622         struct berval maxcsn;
 623         Filter cf;
 624         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 625         fpres_cookie pcookie;
 626         sync_control *srs = NULL;
 627         struct slap_limits_set fc_limits;
 628         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 629         int maxid;
 630
 631         if ( mode != FIND_MAXCSN ) {
 632                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 633         }
 634
 635         fop = *op;
 636         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 637         /* We want pure entries, not referrals */
 638         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 639
 640         cf.f_ava = &eq;
 641         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 642         BER_BVZERO( &cf.f_av_value );
 643         cf.f_next = NULL;
 644
 645         fop.o_callback = &cb;
 646         fop.ors_limit = NULL;
 647         fop.ors_tlimit = SLAP_NO_LIMIT;
 648         fop.ors_filter = &cf;
 649         fop.ors_filterstr.bv_val = buf;
 650
 651 again:
 652         switch( mode ) {
 653         case FIND_MAXCSN:
 654                 cf.f_choice = LDAP_FILTER_GE;
 655                 /* If there are multiple CSNs, use the one with our serverID */
 656                 for ( i=0; i<si->si_numcsns; i++) {
 657                         if ( slap_serverID == si->si_sids[i] ) {
 658                                 maxid = i;
 659                                 break;
 660                         }
 661                 }
 662                 if ( i == si->si_numcsns ) {
 663                         /* No match: this is multimaster, and none of the content in the DB
 664                          * originated locally. Treat like no CSN.
 665                          */
 666                         return LDAP_NO_SUCH_OBJECT;
 667                 }
 668                 cf.f_av_value = si->si_ctxcsn[maxid];
 669                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 670                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 671                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 672                         return LDAP_OTHER;
 673                 }
 674                 fop.ors_attrsonly = 0;
 675                 fop.ors_attrs = csn_anlist;
 676                 fop.ors_slimit = SLAP_NO_LIMIT;
 677                 cb.sc_private = &maxcsn;
 678                 cb.sc_response = findmax_cb;
 679                 strcpy( cbuf, cf.f_av_value.bv_val );
 680                 maxcsn.bv_val = cbuf;
 681                 maxcsn.bv_len = cf.f_av_value.bv_len;
 682                 break;
 683         case FIND_CSN:
 684                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 685                         cf.f_av_value = *csn;
 686                 }
 687                 fop.o_dn = op->o_bd->be_rootdn;
 688                 fop.o_ndn = op->o_bd->be_rootndn;
 689                 fop.o_req_dn = op->o_bd->be_suffix[0];
 690                 fop.o_req_ndn = op->o_bd->be_nsuffix[0];
 691                 /* Look for exact match the first time */
 692                 if ( findcsn_retry ) {
 693                         cf.f_choice = LDAP_FILTER_EQUALITY;
 694                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 695                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 696                 /* On retry, look for <= */
 697                 } else {
 698                         cf.f_choice = LDAP_FILTER_LE;
 699                         fop.ors_limit = &fc_limits;
 700                         memset( &fc_limits, 0, sizeof( fc_limits ));
 701                         fc_limits.lms_s_unchecked = 1;
 702                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 703                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 704                 }
 705                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 706                         return LDAP_OTHER;
 707                 }
 708                 fop.ors_attrsonly = 1;
 709                 fop.ors_attrs = slap_anlist_no_attrs;
 710                 fop.ors_slimit = 1;
 711                 cb.sc_private = NULL;
 712                 cb.sc_response = findcsn_cb;
 713                 break;
 714         case FIND_PRESENT:
 715                 fop.ors_filter = op->ors_filter;
 716                 fop.ors_filterstr = op->ors_filterstr;
 717                 fop.ors_attrsonly = 0;
 718                 fop.ors_attrs = uuid_anlist;
 719                 fop.ors_slimit = SLAP_NO_LIMIT;
 720                 cb.sc_private = &pcookie;
 721                 cb.sc_response = findpres_cb;
 722                 pcookie.num = 0;
 723
 724                 /* preallocate storage for a full set */
 725                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 726                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 727                         op->o_tmpmemctx );
 728                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 729                 pcookie.uuids[0].bv_val = pcookie.last;
 730                 pcookie.uuids[0].bv_len = UUID_LEN;
 731                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 732                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 733                         pcookie.uuids[i].bv_len = UUID_LEN;
 734                 }
 735                 break;
 736         }
 737
 738         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 739         fop.o_bd->be_search( &fop, &frs );
 740         fop.o_bd->bd_info = (BackendInfo *)on;
 741
 742         switch( mode ) {
 743         case FIND_MAXCSN:
 744                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 745 #ifdef CHECK_CSN
 746                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 747                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 748 #endif
 749                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 750                         si->si_numops++;        /* ensure a checkpoint */
 751                 }
 752                 break;
 753         case FIND_CSN:
 754                 /* If matching CSN was not found, invalidate the context. */
 755                 if ( !cb.sc_private ) {
 756                         /* If we didn't find an exact match, then try for <= */
 757                         if ( findcsn_retry ) {
 758                                 findcsn_retry = 0;
 759                                 rs_reinit( &frs, REP_RESULT );
 760                                 goto again;
 761                         }
 762                         rc = LDAP_NO_SUCH_OBJECT;
 763                 }
 764                 break;
 765         case FIND_PRESENT:
 766                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 767                 break;
 768         }
 769
 770         return rc;
 771 }
 772
 773 static void free_resinfo( syncres *sr )
 774 {
 775         syncres **st;
 776         int freeit = 0;
 777         ldap_pvt_thread_mutex_lock( &sr->s_info->ri_mutex );
 778         for (st = &sr->s_info->ri_list; *st; st = &(*st)->s_rilist) {
 779                 if (*st == sr) {
 780                         *st = sr->s_rilist;
 781                         break;
 782                 }
 783         }
 784         if ( !sr->s_info->ri_list )
 785                 freeit = 1;
 786         ldap_pvt_thread_mutex_unlock( &sr->s_info->ri_mutex );
 787         if ( freeit ) {
 788                 ldap_pvt_thread_mutex_destroy( &sr->s_info->ri_mutex );
 789                 if ( sr->s_info->ri_e )
 790                         entry_free( sr->s_info->ri_e );
 791                 if ( !BER_BVISNULL( &sr->s_info->ri_cookie ))
 792                         ch_free( sr->s_info->ri_cookie.bv_val );
 793                 ch_free( sr->s_info );
 794         }
 795 }
 796
 797 static int
 798 syncprov_free_syncop( syncops *so, int unlink )
 799 {
 800         syncres *sr, *srnext;
 801         GroupAssertion *ga, *gnext;
 802
 803         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 804         /* already being freed, or still in use */
 805         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 806                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 807                 return 0;
 808         }
 809         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 810         if ( unlink ) {
 811                 syncops **sop;
 812                 ldap_pvt_thread_mutex_lock( &so->s_si->si_ops_mutex );
 813                 for ( sop = &so->s_si->si_ops; *sop; sop = &(*sop)->s_next ) {
 814                         if ( *sop == so ) {
 815                                 *sop = so->s_next;
 816                                 break;
 817                         }
 818                 }
 819                 ldap_pvt_thread_mutex_unlock( &so->s_si->si_ops_mutex );
 820         }
 821         if ( so->s_flags & PS_IS_DETACHED ) {
 822                 filter_free( so->s_op->ors_filter );
 823                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 824                         gnext = ga->ga_next;
 825                         ch_free( ga );
 826                 }
 827                 ch_free( so->s_op );
 828         }
 829         ch_free( so->s_base.bv_val );
 830         for ( sr=so->s_res; sr; sr=srnext ) {
 831                 srnext = sr->s_next;
 832                 free_resinfo( sr );
 833                 ch_free( sr );
 834         }
 835         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 836         ch_free( so );
 837         return 1;
 838 }
 839
 840 /* Send a persistent search response */
 841 static int
 842 syncprov_sendresp( Operation *op, resinfo *ri, syncops *so, int mode )
 843 {
 844         SlapReply rs = { REP_SEARCH };
 845         struct berval cookie, csns[2];
 846         Entry e_uuid = {0};
 847         Attribute a_uuid = {0};
 848
 849         if ( so->s_op->o_abandon )
 850                 return SLAPD_ABANDON;
 851
 852         rs.sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2, op->o_tmpmemctx );
 853         rs.sr_ctrls[1] = NULL;
 854         rs.sr_flags = REP_CTRLS_MUSTBEFREED;
 855         csns[0] = ri->ri_csn;
 856         BER_BVZERO( &csns[1] );
 857         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 858
 859 #ifdef LDAP_DEBUG
 860         if ( so->s_sid > 0 ) {
 861                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 862                         so->s_sid, cookie.bv_val, 0 );
 863         } else {
 864                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 865                         cookie.bv_val, 0, 0 );
 866         }
 867 #endif
 868
 869         e_uuid.e_attrs = &a_uuid;
 870         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 871         a_uuid.a_nvals = &ri->ri_uuid;
 872         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 873                 mode, rs.sr_ctrls, 0, 1, &cookie );
 874         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 875
 876         rs.sr_entry = &e_uuid;
 877         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 878                 e_uuid = *ri->ri_e;
 879                 e_uuid.e_private = NULL;
 880         }
 881
 882         switch( mode ) {
 883         case LDAP_SYNC_ADD:
 884                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 885                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 886                         rs.sr_err = send_search_reference( op, &rs );
 887                         ber_bvarray_free( rs.sr_ref );
 888                         break;
 889                 }
 890                 /* fallthru */
 891         case LDAP_SYNC_MODIFY:
 892                 rs.sr_attrs = op->ors_attrs;
 893                 rs.sr_err = send_search_entry( op, &rs );
 894                 break;
 895         case LDAP_SYNC_DELETE:
 896                 e_uuid.e_attrs = NULL;
 897                 e_uuid.e_name = ri->ri_dn;
 898                 e_uuid.e_nname = ri->ri_ndn;
 899                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 900                         struct berval bv = BER_BVNULL;
 901                         rs.sr_ref = &bv;
 902                         rs.sr_err = send_search_reference( op, &rs );
 903                 } else {
 904                         rs.sr_err = send_search_entry( op, &rs );
 905                 }
 906                 break;
 907         default:
 908                 assert(0);
 909         }
 910         return rs.sr_err;
 911 }
 912
 913 static void
 914 syncprov_qstart( syncops *so );
 915
 916 /* Play back queued responses */
 917 static int
 918 syncprov_qplay( Operation *op, syncops *so )
 919 {
 920         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 921         syncres *sr;
 922         int rc = 0;
 923
 924         do {
 925                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 926                 sr = so->s_res;
 927                 /* Exit loop with mutex held */
 928                 if ( !sr )
 929                         break;
 930                 so->s_res = sr->s_next;
 931                 if ( !so->s_res )
 932                         so->s_restail = NULL;
 933                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 934
 935                 if ( !so->s_op->o_abandon ) {
 936
 937                         if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 938                                 SlapReply rs = { REP_INTERMEDIATE };
 939
 940                                 rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 941                                         &sr->s_info->ri_cookie, 0, NULL, 0 );
 942                         } else {
 943                                 rc = syncprov_sendresp( op, sr->s_info, so, sr->s_mode );
 944                         }
 945                 }
 946
 947                 free_resinfo( sr );
 948                 ch_free( sr );
 949
 950                 if ( so->s_op->o_abandon )
 951                         continue;
 952
 953                 /* Exit loop with mutex held */
 954                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 955                 break;
 956
 957         } while (1);
 958
 959         /* We now only send one change at a time, to prevent one
 960          * psearch from hogging all the CPU. Resubmit this task if
 961          * there are more responses queued and no errors occurred.
 962          */
 963
 964         if ( rc == 0 && so->s_res ) {
 965                 syncprov_qstart( so );
 966         } else {
 967                 so->s_flags ^= PS_TASK_QUEUED;
 968         }
 969
 970         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 971         return rc;
 972 }
 973
 974 /* task for playing back queued responses */
 975 static void *
 976 syncprov_qtask( void *ctx, void *arg )
 977 {
 978         syncops *so = arg;
 979         OperationBuffer opbuf;
 980         Operation *op;
 981         BackendDB be;
 982         int rc;
 983
 984         op = &opbuf.ob_op;
 985         *op = *so->s_op;
 986         op->o_hdr = &opbuf.ob_hdr;
 987         op->o_controls = opbuf.ob_controls;
 988         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 989         op->o_sync = SLAP_CONTROL_IGNORED;
 990
 991         *op->o_hdr = *so->s_op->o_hdr;
 992
 993         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 994         op->o_tmpmfuncs = &slap_sl_mfuncs;
 995         op->o_threadctx = ctx;
 996
 997         /* syncprov_qplay expects a fake db */
 998         be = *so->s_op->o_bd;
 999         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1000         op->o_bd = &be;
1001         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1002         op->o_callback = NULL;
1003
1004         rc = syncprov_qplay( op, so );
1005
1006         /* decrement use count... */
1007         syncprov_free_syncop( so, 1 );
1008
1009         return NULL;
1010 }
1011
1012 /* Start the task to play back queued psearch responses */
1013 static void
1014 syncprov_qstart( syncops *so )
1015 {
1016         so->s_flags |= PS_TASK_QUEUED;
1017         so->s_inuse++;
1018         ldap_pvt_thread_pool_submit( &connection_pool,
1019                 syncprov_qtask, so );
1020 }
1021
1022 /* Queue a persistent search response */
1023 static int
1024 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1025 {
1026         syncres *sr;
1027         resinfo *ri;
1028         int srsize;
1029         struct berval csn = opc->sctxcsn;
1030
1031         sr = ch_malloc( sizeof( syncres ));
1032         sr->s_next = NULL;
1033         sr->s_mode = mode;
1034         if ( !opc->ssres.s_info ) {
1035
1036                 srsize = sizeof( resinfo );
1037                 if ( csn.bv_len )
1038                         srsize += csn.bv_len + 1;
1039
1040                 if ( opc->se ) {
1041                         Attribute *a;
1042                         ri = ch_malloc( srsize );
1043                         ri->ri_dn = opc->se->e_name;
1044                         ri->ri_ndn = opc->se->e_nname;
1045                         a = attr_find( opc->se->e_attrs, slap_schema.si_ad_entryUUID );
1046                         if ( a )
1047                                 ri->ri_uuid = a->a_nvals[0];
1048                         else
1049                                 ri->ri_uuid.bv_len = 0;
1050                         if ( csn.bv_len ) {
1051                                 ri->ri_csn.bv_val = (char *)(ri + 1);
1052                                 ri->ri_csn.bv_len = csn.bv_len;
1053                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1054                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1055                         } else {
1056                                 ri->ri_csn.bv_val = NULL;
1057                         }
1058                 } else {
1059                         srsize += opc->suuid.bv_len +
1060                                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1061                         ri = ch_malloc( srsize );
1062                         ri->ri_dn.bv_val = (char *)(ri + 1);
1063                         ri->ri_dn.bv_len = opc->sdn.bv_len;
1064                         ri->ri_ndn.bv_val = lutil_strcopy( ri->ri_dn.bv_val,
1065                                 opc->sdn.bv_val ) + 1;
1066                         ri->ri_ndn.bv_len = opc->sndn.bv_len;
1067                         ri->ri_uuid.bv_val = lutil_strcopy( ri->ri_ndn.bv_val,
1068                                 opc->sndn.bv_val ) + 1;
1069                         ri->ri_uuid.bv_len = opc->suuid.bv_len;
1070                         AC_MEMCPY( ri->ri_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1071                         if ( csn.bv_len ) {
1072                                 ri->ri_csn.bv_val = ri->ri_uuid.bv_val + ri->ri_uuid.bv_len;
1073                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1074                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1075                         } else {
1076                                 ri->ri_csn.bv_val = NULL;
1077                         }
1078                 }
1079                 ri->ri_list = &opc->ssres;
1080                 ri->ri_e = opc->se;
1081                 ri->ri_csn.bv_len = csn.bv_len;
1082                 ri->ri_isref = opc->sreference;
1083                 BER_BVZERO( &ri->ri_cookie );
1084                 ldap_pvt_thread_mutex_init( &ri->ri_mutex );
1085                 opc->se = NULL;
1086                 opc->ssres.s_info = ri;
1087         }
1088         ri = opc->ssres.s_info;
1089         sr->s_info = ri;
1090         ldap_pvt_thread_mutex_lock( &ri->ri_mutex );
1091         sr->s_rilist = ri->ri_list;
1092         ri->ri_list = sr;
1093         if ( mode == LDAP_SYNC_NEW_COOKIE && BER_BVISNULL( &ri->ri_cookie )) {
1094                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1095
1096                 slap_compose_sync_cookie( NULL, &ri->ri_cookie, si->si_ctxcsn,
1097                         so->s_rid, slap_serverID ? slap_serverID : -1);
1098         }
1099         ldap_pvt_thread_mutex_unlock( &ri->ri_mutex );
1100
1101         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1102         if ( !so->s_res ) {
1103                 so->s_res = sr;
1104         } else {
1105                 so->s_restail->s_next = sr;
1106         }
1107         so->s_restail = sr;
1108
1109         /* If the base of the psearch was modified, check it next time round */
1110         if ( so->s_flags & PS_WROTE_BASE ) {
1111                 so->s_flags ^= PS_WROTE_BASE;
1112                 so->s_flags |= PS_FIND_BASE;
1113         }
1114         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1115                 syncprov_qstart( so );
1116         }
1117         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1118         return LDAP_SUCCESS;
1119 }
1120
1121 static int
1122 syncprov_drop_psearch( syncops *so, int lock )
1123 {
1124         if ( so->s_flags & PS_IS_DETACHED ) {
1125                 if ( lock )
1126                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1127                 so->s_op->o_conn->c_n_ops_executing--;
1128                 so->s_op->o_conn->c_n_ops_completed++;
1129                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1130                         o_next );
1131                 if ( lock )
1132                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1133         }
1134         return syncprov_free_syncop( so, 0 );
1135 }
1136
1137 static int
1138 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1139 {
1140         slap_callback *sc = op->o_callback;
1141         op->o_callback = sc->sc_next;
1142         syncprov_drop_psearch( sc->sc_private, 0 );
1143         op->o_tmpfree( sc, op->o_tmpmemctx );
1144         return 0;
1145 }
1146
1147 static int
1148 syncprov_op_abandon( Operation *op, SlapReply *rs )
1149 {
1150         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1151         syncprov_info_t         *si = on->on_bi.bi_private;
1152         syncops *so, **sop;
1153
1154         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1155         for ( sop=&si->si_ops; (so = *sop); sop = &(*sop)->s_next ) {
1156                 if ( so->s_op->o_connid == op->o_connid &&
1157                         so->s_op->o_msgid == op->orn_msgid ) {
1158                                 so->s_op->o_abandon = 1;
1159                                 *sop = so->s_next;
1160                                 break;
1161                 }
1162         }
1163         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1164         if ( so ) {
1165                 /* Is this really a Cancel exop? */
1166                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1167                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1168                         rs->sr_err = LDAP_CANCELLED;
1169                         send_ldap_result( so->s_op, rs );
1170                         if ( so->s_flags & PS_IS_DETACHED ) {
1171                                 slap_callback *cb;
1172                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1173                                 cb->sc_cleanup = syncprov_ab_cleanup;
1174                                 cb->sc_next = op->o_callback;
1175                                 cb->sc_private = so;
1176                                 op->o_callback = cb;
1177                                 return SLAP_CB_CONTINUE;
1178                         }
1179                 }
1180                 syncprov_drop_psearch( so, 0 );
1181         }
1182         return SLAP_CB_CONTINUE;
1183 }
1184
1185 /* Find which persistent searches are affected by this operation */
1186 static void
1187 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1188 {
1189         slap_overinst *on = opc->son;
1190         syncprov_info_t         *si = on->on_bi.bi_private;
1191
1192         fbase_cookie fc;
1193         syncops **pss;
1194         Entry *e = NULL;
1195         Attribute *a;
1196         int rc, gonext;
1197         struct berval newdn;
1198         int freefdn = 0;
1199         BackendDB *b0 = op->o_bd, db;
1200
1201         fc.fdn = &op->o_req_ndn;
1202         /* compute new DN */
1203         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1204                 struct berval pdn;
1205                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1206                 else dnParent( fc.fdn, &pdn );
1207                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1208                 fc.fdn = &newdn;
1209                 freefdn = 1;
1210         }
1211         if ( op->o_tag != LDAP_REQ_ADD ) {
1212                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1213                         db = *op->o_bd;
1214                         op->o_bd = &db;
1215                 }
1216                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1217                 /* If we're sending responses now, make a copy and unlock the DB */
1218                 if ( e && !saveit ) {
1219                         if ( !opc->se )
1220                                 opc->se = entry_dup( e );
1221                         overlay_entry_release_ov( op, e, 0, on );
1222                         e = opc->se;
1223                 }
1224                 if ( rc ) {
1225                         op->o_bd = b0;
1226                         return;
1227                 }
1228         } else {
1229                 e = op->ora_e;
1230                 if ( !saveit ) {
1231                         if ( !opc->se )
1232                                 opc->se = entry_dup( e );
1233                         e = opc->se;
1234                 }
1235         }
1236
1237         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1238                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1239                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1240                 opc->sreference = is_entry_referral( e );
1241                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1242                 if ( a )
1243                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1244         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1245                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1246                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1247                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1248                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1249         }
1250
1251         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1252         for (pss = &si->si_ops; *pss; pss = gonext ? &(*pss)->s_next : pss)
1253         {
1254                 Operation op2;
1255                 Opheader oh;
1256                 syncmatches *sm;
1257                 int found = 0;
1258                 syncops *snext, *ss = *pss;
1259
1260                 gonext = 1;
1261                 if ( ss->s_op->o_abandon )
1262                         continue;
1263
1264                 /* Don't send ops back to the originator */
1265                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1266                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1267                                 opc->osid, 0, 0 );
1268                         continue;
1269                 }
1270
1271                 /* Don't send ops back to the messenger */
1272                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1273                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1274                                 opc->rsid, 0, 0 );
1275                         continue;
1276                 }
1277
1278                 /* validate base */
1279                 fc.fss = ss;
1280                 fc.fbase = 0;
1281                 fc.fscope = 0;
1282
1283                 /* If the base of the search is missing, signal a refresh */
1284                 rc = syncprov_findbase( op, &fc );
1285                 if ( rc != LDAP_SUCCESS ) {
1286                         SlapReply rs = {REP_RESULT};
1287                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1288                                 "search base has changed" );
1289                         snext = ss->s_next;
1290                         if ( syncprov_drop_psearch( ss, 1 ) )
1291                                 *pss = snext;
1292                         gonext = 0;
1293                         continue;
1294                 }
1295
1296                 /* If we're sending results now, look for this op in old matches */
1297                 if ( !saveit ) {
1298                         syncmatches *old;
1299
1300                         /* Did we modify the search base? */
1301                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1302                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1303                                 ss->s_flags |= PS_WROTE_BASE;
1304                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1305                         }
1306
1307                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1308                                 old=sm, sm=sm->sm_next ) {
1309                                 if ( sm->sm_op == ss ) {
1310                                         found = 1;
1311                                         old->sm_next = sm->sm_next;
1312                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1313                                         break;
1314                                 }
1315                         }
1316                 }
1317
1318                 if ( fc.fscope ) {
1319                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1320                         op2 = *ss->s_op;
1321                         oh = *op->o_hdr;
1322                         oh.oh_conn = ss->s_op->o_conn;
1323                         oh.oh_connid = ss->s_op->o_connid;
1324                         op2.o_bd = op->o_bd->bd_self;
1325                         op2.o_hdr = &oh;
1326                         op2.o_extra = op->o_extra;
1327                         op2.o_callback = NULL;
1328                         if (ss->s_flags & PS_FIX_FILTER) {
1329                                 /* Skip the AND/GE clause that we stuck on in front. We
1330                                    would lose deletes/mods that happen during the refresh
1331                                    phase otherwise (ITS#6555) */
1332                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1333                         }
1334                         rc = test_filter( &op2, e, op2.ors_filter );
1335                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1336                 }
1337
1338                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1339                         ss->s_sid, fc.fscope, rc );
1340
1341                 /* check if current o_req_dn is in scope and matches filter */
1342                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1343                         if ( saveit ) {
1344                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1345                                 sm->sm_next = opc->smatches;
1346                                 sm->sm_op = ss;
1347                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1348                                 ++ss->s_inuse;
1349                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1350                                 opc->smatches = sm;
1351                         } else {
1352                                 /* if found send UPDATE else send ADD */
1353                                 syncprov_qresp( opc, ss,
1354                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1355                         }
1356                 } else if ( !saveit && found ) {
1357                         /* send DELETE */
1358                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1359                 } else if ( !saveit ) {
1360                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1361                 }
1362                 if ( !saveit && found ) {
1363                         /* Decrement s_inuse, was incremented when called
1364                          * with saveit == TRUE
1365                          */
1366                         snext = ss->s_next;
1367                         if ( syncprov_free_syncop( ss, 0 ) ) {
1368                                 *pss = snext;
1369                                 gonext = 0;
1370                         }
1371                 }
1372         }
1373         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1374
1375         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1376                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1377                         op->o_bd = &db;
1378                 }
1379                 if ( saveit )
1380                         overlay_entry_release_ov( op, e, 0, on );
1381                 op->o_bd = b0;
1382         }
1383         if ( !saveit ) {
1384                 if ( opc->ssres.s_info )
1385                         free_resinfo( &opc->ssres );
1386                 else if ( opc->se )
1387                         entry_free( opc->se );
1388         }
1389         if ( freefdn ) {
1390                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1391         }
1392         op->o_bd = b0;
1393 }
1394
1395 static int
1396 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1397 {
1398         slap_callback *cb = op->o_callback;
1399         opcookie *opc = cb->sc_private;
1400         slap_overinst *on = opc->son;
1401         syncprov_info_t         *si = on->on_bi.bi_private;
1402         syncmatches *sm, *snext;
1403         modtarget *mt;
1404
1405         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1406         if ( si->si_active )
1407                 si->si_active--;
1408         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1409
1410         for (sm = opc->smatches; sm; sm=snext) {
1411                 snext = sm->sm_next;
1412                 syncprov_free_syncop( sm->sm_op, 1 );
1413                 op->o_tmpfree( sm, op->o_tmpmemctx );
1414         }
1415
1416         /* Remove op from lock table */
1417         mt = opc->smt;
1418         if ( mt ) {
1419                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1420                 mt->mt_mods = mt->mt_mods->mi_next;
1421                 /* If there are more, promote the next one */
1422                 if ( mt->mt_mods ) {
1423                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1424                 } else {
1425                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1426                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1427                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1428                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1429                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1430                         ch_free( mt->mt_dn.bv_val );
1431                         ch_free( mt );
1432                 }
1433         }
1434         if ( !BER_BVISNULL( &opc->suuid ))
1435                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1436         if ( !BER_BVISNULL( &opc->sndn ))
1437                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1438         if ( !BER_BVISNULL( &opc->sdn ))
1439                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1440         op->o_callback = cb->sc_next;
1441         op->o_tmpfree(cb, op->o_tmpmemctx);
1442
1443         return 0;
1444 }
1445
1446 static void
1447 syncprov_checkpoint( Operation *op, slap_overinst *on )
1448 {
1449         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1450         Modifications mod;
1451         Operation opm;
1452         SlapReply rsm = {REP_RESULT};
1453         slap_callback cb = {0};
1454         BackendDB be;
1455         BackendInfo *bi;
1456
1457 #ifdef CHECK_CSN
1458         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1459
1460         int i;
1461         for ( i=0; i<si->si_numcsns; i++ ) {
1462                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1463         }
1464 #endif
1465         mod.sml_numvals = si->si_numcsns;
1466         mod.sml_values = si->si_ctxcsn;
1467         mod.sml_nvalues = NULL;
1468         mod.sml_desc = slap_schema.si_ad_contextCSN;
1469         mod.sml_op = LDAP_MOD_REPLACE;
1470         mod.sml_flags = SLAP_MOD_INTERNAL;
1471         mod.sml_next = NULL;
1472
1473         cb.sc_response = slap_null_cb;
1474         opm = *op;
1475         opm.o_tag = LDAP_REQ_MODIFY;
1476         opm.o_callback = &cb;
1477         opm.orm_modlist = &mod;
1478         opm.orm_no_opattrs = 1;
1479         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1480                 be = *on->on_info->oi_origdb;
1481                 opm.o_bd = &be;
1482         }
1483         opm.o_req_dn = si->si_contextdn;
1484         opm.o_req_ndn = si->si_contextdn;
1485         bi = opm.o_bd->bd_info;
1486         opm.o_bd->bd_info = on->on_info->oi_orig;
1487         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1488         opm.o_no_schema_check = 1;
1489         opm.o_bd->be_modify( &opm, &rsm );
1490
1491         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1492                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1493                 const char      *text;
1494                 char txtbuf[SLAP_TEXT_BUFLEN];
1495                 size_t textlen = sizeof txtbuf;
1496                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1497                 rs_reinit( &rsm, REP_RESULT );
1498                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1499                 opm.ora_e = e;
1500                 opm.o_bd->be_add( &opm, &rsm );
1501                 if ( e == opm.ora_e )
1502                         be_entry_release_w( &opm, opm.ora_e );
1503         }
1504         opm.o_bd->bd_info = bi;
1505
1506         if ( mod.sml_next != NULL ) {
1507                 slap_mods_free( mod.sml_next, 1 );
1508         }
1509 #ifdef CHECK_CSN
1510         for ( i=0; i<si->si_numcsns; i++ ) {
1511                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1512         }
1513 #endif
1514 }
1515
1516 static void
1517 syncprov_add_slog( Operation *op )
1518 {
1519         opcookie *opc = op->o_callback->sc_private;
1520         slap_overinst *on = opc->son;
1521         syncprov_info_t         *si = on->on_bi.bi_private;
1522         sessionlog *sl;
1523         slog_entry *se;
1524
1525         sl = si->si_logs;
1526         {
1527                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1528                         /* During the syncrepl refresh phase we can receive operations
1529                          * without a csn.  We cannot reliably determine the consumers
1530                          * state with respect to such operations, so we ignore them and
1531                          * wipe out anything in the log if we see them.
1532                          */
1533                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1534                         while ( se = sl->sl_head ) {
1535                                 sl->sl_head = se->se_next;
1536                                 ch_free( se );
1537                         }
1538                         sl->sl_tail = NULL;
1539                         sl->sl_num = 0;
1540                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1541                         return;
1542                 }
1543
1544                 /* Allocate a record. UUIDs are not NUL-terminated. */
1545                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1546                         op->o_csn.bv_len + 1 );
1547                 se->se_next = NULL;
1548                 se->se_tag = op->o_tag;
1549
1550                 se->se_uuid.bv_val = (char *)(&se[1]);
1551                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1552                 se->se_uuid.bv_len = opc->suuid.bv_len;
1553
1554                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1555                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1556                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1557                 se->se_csn.bv_len = op->o_csn.bv_len;
1558                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1559
1560                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1561                 if ( sl->sl_head ) {
1562                         /* Keep the list in csn order. */
1563                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1564                                 sl->sl_tail->se_next = se;
1565                                 sl->sl_tail = se;
1566                         } else {
1567                                 slog_entry **sep;
1568
1569                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1570                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1571                                                 se->se_next = *sep;
1572                                                 *sep = se;
1573                                                 break;
1574                                         }
1575                                 }
1576                         }
1577                 } else {
1578                         sl->sl_head = se;
1579                         sl->sl_tail = se;
1580                         if ( !sl->sl_mincsn ) {
1581                                 sl->sl_numcsns = 1;
1582                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1583                                 sl->sl_sids = ch_malloc( sizeof( int ));
1584                                 sl->sl_sids[0] = se->se_sid;
1585                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1586                                 BER_BVZERO( &sl->sl_mincsn[1] );
1587                         }
1588                 }
1589                 sl->sl_num++;
1590                 while ( sl->sl_num > sl->sl_size ) {
1591                         int i, j;
1592                         se = sl->sl_head;
1593                         sl->sl_head = se->se_next;
1594                         for ( i=0; i<sl->sl_numcsns; i++ )
1595                                 if ( sl->sl_sids[i] >= se->se_sid )
1596                                         break;
1597                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1598                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1599                                         i, se->se_sid, &se->se_csn );
1600                         } else {
1601                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1602                         }
1603                         ch_free( se );
1604                         sl->sl_num--;
1605                 }
1606                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1607         }
1608 }
1609
1610 /* Just set a flag if we found the matching entry */
1611 static int
1612 playlog_cb( Operation *op, SlapReply *rs )
1613 {
1614         if ( rs->sr_type == REP_SEARCH ) {
1615                 op->o_callback->sc_private = (void *)1;
1616         }
1617         return rs->sr_err;
1618 }
1619
1620 /* enter with sl->sl_mutex locked, release before returning */
1621 static void
1622 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1623         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1624 {
1625         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1626         slog_entry *se;
1627         int i, j, ndel, num, nmods, mmods;
1628         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1629         BerVarray uuids;
1630         struct berval delcsn[2];
1631
1632         if ( !sl->sl_num ) {
1633                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1634                 return;
1635         }
1636
1637         num = sl->sl_num;
1638         i = 0;
1639         nmods = 0;
1640
1641         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1642                 num * UUID_LEN, op->o_tmpmemctx );
1643         uuids[0].bv_val = (char *)(uuids + num + 1);
1644
1645         delcsn[0].bv_len = 0;
1646         delcsn[0].bv_val = cbuf;
1647         BER_BVZERO(&delcsn[1]);
1648
1649         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1650          * and everything else at the end. Do this first so we can
1651          * unlock the list mutex.
1652          */
1653         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1654                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1655         for ( se=sl->sl_head; se; se=se->se_next ) {
1656                 int k;
1657                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1658                 ndel = 1;
1659                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1660                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1661                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1662                                 break;
1663                         }
1664                 }
1665                 if ( ndel <= 0 ) {
1666                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1667                         continue;
1668                 }
1669                 ndel = 0;
1670                 for ( k=0; k<numcsns; k++ ) {
1671                         if ( se->se_sid == sids[k] ) {
1672                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1673                                 break;
1674                         }
1675                 }
1676                 if ( ndel > 0 ) {
1677                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1678                         break;
1679                 }
1680                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1681                         j = i;
1682                         i++;
1683                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1684                         delcsn[0].bv_len = se->se_csn.bv_len;
1685                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1686                 } else {
1687                         if ( se->se_tag == LDAP_REQ_ADD )
1688                                 continue;
1689                         nmods++;
1690                         j = num - nmods;
1691                 }
1692                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1693                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1694                 uuids[j].bv_len = UUID_LEN;
1695         }
1696         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1697
1698         ndel = i;
1699
1700         /* Zero out unused slots */
1701         for ( i=ndel; i < num - nmods; i++ )
1702                 uuids[i].bv_len = 0;
1703
1704         /* Mods must be validated to see if they belong in this delete set.
1705          */
1706
1707         mmods = nmods;
1708         /* Strip any duplicates */
1709         for ( i=0; i<nmods; i++ ) {
1710                 for ( j=0; j<ndel; j++ ) {
1711                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1712                                 uuids[num - 1 - i].bv_len = 0;
1713                                 mmods --;
1714                                 break;
1715                         }
1716                 }
1717                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1718                 for ( j=0; j<i; j++ ) {
1719                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1720                                 uuids[num - 1 - i].bv_len = 0;
1721                                 mmods --;
1722                                 break;
1723                         }
1724                 }
1725         }
1726
1727         if ( mmods ) {
1728                 Operation fop;
1729                 int rc;
1730                 Filter mf, af;
1731                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1732                 slap_callback cb = {0};
1733
1734                 fop = *op;
1735
1736                 fop.o_sync_mode = 0;
1737                 fop.o_callback = &cb;
1738                 fop.ors_limit = NULL;
1739                 fop.ors_tlimit = SLAP_NO_LIMIT;
1740                 fop.ors_attrs = slap_anlist_all_attributes;
1741                 fop.ors_attrsonly = 0;
1742                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1743
1744                 af.f_choice = LDAP_FILTER_AND;
1745                 af.f_next = NULL;
1746                 af.f_and = &mf;
1747                 mf.f_choice = LDAP_FILTER_EQUALITY;
1748                 mf.f_ava = &eq;
1749                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1750                 mf.f_next = fop.ors_filter;
1751
1752                 fop.ors_filter = &af;
1753
1754                 cb.sc_response = playlog_cb;
1755                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1756
1757                 for ( i=ndel; i<num; i++ ) {
1758                   if ( uuids[i].bv_len != 0 ) {
1759                         SlapReply frs = { REP_RESULT };
1760
1761                         mf.f_av_value = uuids[i];
1762                         cb.sc_private = NULL;
1763                         fop.ors_slimit = 1;
1764                         rc = fop.o_bd->be_search( &fop, &frs );
1765
1766                         /* If entry was not found, add to delete list */
1767                         if ( !cb.sc_private ) {
1768                                 uuids[ndel++] = uuids[i];
1769                         }
1770                   }
1771                 }
1772                 fop.o_bd->bd_info = (BackendInfo *)on;
1773         }
1774         if ( ndel ) {
1775                 struct berval cookie;
1776
1777                 if ( delcsn[0].bv_len ) {
1778                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1779                                 slap_serverID ? slap_serverID : -1 );
1780
1781                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1782                 }
1783
1784                 uuids[ndel].bv_val = NULL;
1785                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1786                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1787                 if ( delcsn[0].bv_len ) {
1788                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1789                 }
1790         }
1791         op->o_tmpfree( uuids, op->o_tmpmemctx );
1792 }
1793
1794 static int
1795 syncprov_op_response( Operation *op, SlapReply *rs )
1796 {
1797         opcookie *opc = op->o_callback->sc_private;
1798         slap_overinst *on = opc->son;
1799         syncprov_info_t         *si = on->on_bi.bi_private;
1800         syncmatches *sm;
1801
1802         if ( rs->sr_err == LDAP_SUCCESS )
1803         {
1804                 struct berval maxcsn;
1805                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1806                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1807
1808                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1809
1810                 /* Update our context CSN */
1811                 cbuf[0] = '\0';
1812                 maxcsn.bv_val = cbuf;
1813                 maxcsn.bv_len = sizeof(cbuf);
1814                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1815
1816                 slap_get_commit_csn( op, &maxcsn, &foundit );
1817                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1818                         /* syncrepl queues the CSN values in the db where
1819                          * it is configured , not where the changes are made.
1820                          * So look for a value in the glue db if we didn't
1821                          * find any in this db.
1822                          */
1823                         BackendDB *be = op->o_bd;
1824                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1825                         maxcsn.bv_val = cbuf;
1826                         maxcsn.bv_len = sizeof(cbuf);
1827                         slap_get_commit_csn( op, &maxcsn, &foundit );
1828                         op->o_bd = be;
1829                 }
1830                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1831                         int i, sid;
1832 #ifdef CHECK_CSN
1833                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1834                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1835 #endif
1836                         sid = slap_parse_csn_sid( &maxcsn );
1837                         for ( i=0; i<si->si_numcsns; i++ ) {
1838                                 if ( sid < si->si_sids[i] )
1839                                         break;
1840                                 if ( sid == si->si_sids[i] ) {
1841                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1842                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1843                                                 csn_changed = 1;
1844                                         }
1845                                         break;
1846                                 }
1847                         }
1848                         /* It's a new SID for us */
1849                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1850                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1851                                         i, sid, &maxcsn );
1852                                 csn_changed = 1;
1853                         }
1854                 }
1855
1856                 /* Don't do any processing for consumer contextCSN updates */
1857                 if ( op->o_dont_replicate ) {
1858                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1859                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1860                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1861                         /* Catch contextCSN updates from syncrepl. We have to look at
1862                          * all the attribute values, as there may be more than one csn
1863                          * that changed, and only one can be passed in the csn queue.
1864                          */
1865                         Modifications *mod = op->orm_modlist;
1866                         unsigned i;
1867                         int j, sid;
1868
1869                         for ( i=0; i<mod->sml_numvals; i++ ) {
1870                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1871                                 for ( j=0; j<si->si_numcsns; j++ ) {
1872                                         if ( sid < si->si_sids[j] )
1873                                                 break;
1874                                         if ( sid == si->si_sids[j] ) {
1875                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1876                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1877                                                         csn_changed = 1;
1878                                                 }
1879                                                 break;
1880                                         }
1881                                 }
1882
1883                                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1884                                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1885                                                 j, sid, &mod->sml_values[i] );
1886                                         csn_changed = 1;
1887                                 }
1888                         }
1889                         if ( csn_changed )
1890                                 si->si_dirty = 0;
1891                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1892
1893                         if ( csn_changed ) {
1894                                 syncops *ss;
1895                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1896                                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1897                                         if ( ss->s_op->o_abandon )
1898                                                 continue;
1899                                         /* Send the updated csn to all syncrepl consumers,
1900                                          * including the server from which it originated.
1901                                          * The syncrepl consumer and syncprov provider on
1902                                          * the originating server may be configured to store
1903                                          * their csn values in different entries.
1904                                          */
1905                                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1906                                 }
1907                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1908                         }
1909                         } else {
1910                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1911                         }
1912                         goto leave;
1913                 }
1914
1915                 si->si_numops++;
1916                 if ( si->si_chkops || si->si_chktime ) {
1917                         /* Never checkpoint adding the context entry,
1918                          * it will deadlock
1919                          */
1920                         if ( op->o_tag != LDAP_REQ_ADD ||
1921                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1922                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1923                                         do_check = 1;
1924                                         si->si_numops = 0;
1925                                 }
1926                                 if ( si->si_chktime &&
1927                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1928                                         if ( si->si_chklast ) {
1929                                                 do_check = 1;
1930                                                 si->si_chklast = op->o_time;
1931                                         } else {
1932                                                 si->si_chklast = 1;
1933                                         }
1934                                 }
1935                         }
1936                 }
1937                 si->si_dirty = !csn_changed;
1938                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1939
1940                 if ( do_check ) {
1941                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1942                         syncprov_checkpoint( op, on );
1943                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1944                 }
1945
1946                 /* only update consumer ctx if this is a newer csn */
1947                 if ( csn_changed ) {
1948                         opc->sctxcsn = maxcsn;
1949                 }
1950
1951                 /* Handle any persistent searches */
1952                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1953                 have_psearches = ( si->si_ops != NULL );
1954                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1955                 if ( have_psearches ) {
1956                         switch(op->o_tag) {
1957                         case LDAP_REQ_ADD:
1958                         case LDAP_REQ_MODIFY:
1959                         case LDAP_REQ_MODRDN:
1960                         case LDAP_REQ_EXTENDED:
1961                                 syncprov_matchops( op, opc, 0 );
1962                                 break;
1963                         case LDAP_REQ_DELETE:
1964                                 /* for each match in opc->smatches:
1965                                  *   send DELETE msg
1966                                  */
1967                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1968                                         if ( sm->sm_op->s_op->o_abandon )
1969                                                 continue;
1970                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1971                                 }
1972                                 break;
1973                         }
1974                 }
1975
1976                 /* Add any log records */
1977                 if ( si->si_logs ) {
1978                         syncprov_add_slog( op );
1979                 }
1980 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1981         }
1982         return SLAP_CB_CONTINUE;
1983 }
1984
1985 /* We don't use a subentry to store the context CSN any more.
1986  * We expose the current context CSN as an operational attribute
1987  * of the suffix entry.
1988  */
1989 static int
1990 syncprov_op_compare( Operation *op, SlapReply *rs )
1991 {
1992         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1993         syncprov_info_t         *si = on->on_bi.bi_private;
1994         int rc = SLAP_CB_CONTINUE;
1995
1996         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1997                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1998         {
1999                 Entry e = {0};
2000                 Attribute a = {0};
2001
2002                 e.e_name = si->si_contextdn;
2003                 e.e_nname = si->si_contextdn;
2004                 e.e_attrs = &a;
2005
2006                 a.a_desc = slap_schema.si_ad_contextCSN;
2007
2008                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2009
2010                 a.a_vals = si->si_ctxcsn;
2011                 a.a_nvals = a.a_vals;
2012                 a.a_numvals = si->si_numcsns;
2013
2014                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
2015                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
2016                 if ( ! rs->sr_err ) {
2017                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
2018                         goto return_results;
2019                 }
2020
2021                 if ( get_assert( op ) &&
2022                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
2023                 {
2024                         rs->sr_err = LDAP_ASSERTION_FAILED;
2025                         goto return_results;
2026                 }
2027
2028
2029                 rs->sr_err = LDAP_COMPARE_FALSE;
2030
2031                 if ( attr_valfind( &a,
2032                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2033                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2034                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2035                 {
2036                         rs->sr_err = LDAP_COMPARE_TRUE;
2037                 }
2038
2039 return_results:;
2040
2041                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2042
2043                 send_ldap_result( op, rs );
2044
2045                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2046                         rs->sr_err = LDAP_SUCCESS;
2047                 }
2048                 rc = rs->sr_err;
2049         }
2050
2051         return rc;
2052 }
2053
2054 static int
2055 syncprov_op_mod( Operation *op, SlapReply *rs )
2056 {
2057         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2058         syncprov_info_t         *si = on->on_bi.bi_private;
2059         slap_callback *cb;
2060         opcookie *opc;
2061         int have_psearches, cbsize;
2062
2063         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2064         have_psearches = ( si->si_ops != NULL );
2065         si->si_active++;
2066         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2067
2068         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2069                 (have_psearches ? sizeof(modinst) : 0 );
2070
2071         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2072         opc = (opcookie *)(cb+1);
2073         opc->son = on;
2074         cb->sc_response = syncprov_op_response;
2075         cb->sc_cleanup = syncprov_op_cleanup;
2076         cb->sc_private = opc;
2077         cb->sc_next = op->o_callback;
2078         op->o_callback = cb;
2079
2080         opc->osid = -1;
2081         opc->rsid = -1;
2082         if ( op->o_csn.bv_val ) {
2083                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2084         }
2085         if ( op->o_controls ) {
2086                 struct sync_cookie *scook =
2087                 op->o_controls[slap_cids.sc_LDAPsync];
2088                 if ( scook )
2089                         opc->rsid = scook->sid;
2090         }
2091
2092         if ( op->o_dont_replicate )
2093                 return SLAP_CB_CONTINUE;
2094
2095         /* If there are active persistent searches, lock this operation.
2096          * See seqmod.c for the locking logic on its own.
2097          */
2098         if ( have_psearches ) {
2099                 modtarget *mt, mtdummy;
2100                 modinst *mi;
2101
2102                 mi = (modinst *)(opc+1);
2103                 mi->mi_op = op;
2104
2105                 /* See if we're already modifying this entry... */
2106                 mtdummy.mt_dn = op->o_req_ndn;
2107                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2108                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2109                 if ( mt ) {
2110                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2111                         if ( mt->mt_mods == NULL ) {
2112                                 /* Cannot reuse this mt, as another thread is about
2113                                  * to release it in syncprov_op_cleanup.
2114                                  */
2115                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2116                                 mt = NULL;
2117                         }
2118                 }
2119                 if ( mt ) {
2120                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2121                         mt->mt_tail->mi_next = mi;
2122                         mt->mt_tail = mi;
2123                         /* wait for this op to get to head of list */
2124                         while ( mt->mt_mods != mi ) {
2125                                 /* don't wait on other mods from the same thread */
2126                                 if ( mt->mt_mods->mi_op->o_threadctx == op->o_threadctx )
2127                                         break;
2128
2129                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2130                                 /* FIXME: if dynamic config can delete overlays or
2131                                  * databases we'll have to check for cleanup here.
2132                                  * Currently it's not an issue because there are
2133                                  * no dynamic config deletes...
2134                                  */
2135                                 if ( slapd_shutdown )
2136                                         return SLAPD_ABANDON;
2137
2138                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2139                                         ldap_pvt_thread_yield();
2140                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2141
2142                                 /* clean up if the caller is giving up */
2143                                 if ( op->o_abandon ) {
2144                                         modinst *m2;
2145                                         for ( m2 = mt->mt_mods; m2 && m2->mi_next != mi;
2146                                                 m2 = m2->mi_next );
2147                                         if ( m2 ) {
2148                                                 m2->mi_next = mi->mi_next;
2149                                                 if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2150                                         }
2151                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2152                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2153                                         return SLAPD_ABANDON;
2154                                 }
2155                         }
2156                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2157                 } else {
2158                         /* Record that we're modifying this entry now */
2159                         mt = ch_malloc( sizeof(modtarget) );
2160                         mt->mt_mods = mi;
2161                         mt->mt_tail = mi;
2162                         ber_dupbv( &mt->mt_dn, &mi->mi_op->o_req_ndn );
2163                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2164                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2165                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2166                 }
2167                 opc->smt = mt;
2168         }
2169
2170         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2171                 syncprov_matchops( op, opc, 1 );
2172
2173         return SLAP_CB_CONTINUE;
2174 }
2175
2176 static int
2177 syncprov_op_extended( Operation *op, SlapReply *rs )
2178 {
2179         if ( exop_is_write( op ))
2180                 return syncprov_op_mod( op, rs );
2181
2182         return SLAP_CB_CONTINUE;
2183 }
2184
2185 typedef struct searchstate {
2186         slap_overinst *ss_on;
2187         syncops *ss_so;
2188         BerVarray ss_ctxcsn;
2189         int *ss_sids;
2190         int ss_numcsns;
2191 #define SS_PRESENT      0x01
2192 #define SS_CHANGED      0x02
2193         int ss_flags;
2194 } searchstate;
2195
2196 typedef struct SyncOperationBuffer {
2197         Operation               sob_op;
2198         Opheader                sob_hdr;
2199         OpExtra                 sob_oe;
2200         AttributeName   sob_extra;      /* not always present */
2201         /* Further data allocated here */
2202 } SyncOperationBuffer;
2203
2204 static void
2205 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2206 {
2207         SyncOperationBuffer *sopbuf2;
2208         Operation *op2;
2209         int i, alen = 0;
2210         size_t size;
2211         char *ptr;
2212         GroupAssertion *g1, *g2;
2213
2214         /* count the search attrs */
2215         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2216                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2217         }
2218         /* Make a new copy of the operation */
2219         size = offsetof( SyncOperationBuffer, sob_extra ) +
2220                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2221                 op->o_req_dn.bv_len + 1 +
2222                 op->o_req_ndn.bv_len + 1 +
2223                 op->o_ndn.bv_len + 1 +
2224                 so->s_filterstr.bv_len + 1;
2225         sopbuf2 = ch_calloc( 1, size );
2226         op2 = &sopbuf2->sob_op;
2227         op2->o_hdr = &sopbuf2->sob_hdr;
2228         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2229
2230         /* Copy the fields we care about explicitly, leave the rest alone */
2231         *op2->o_hdr = *op->o_hdr;
2232         op2->o_tag = op->o_tag;
2233         op2->o_time = op->o_time;
2234         op2->o_bd = on->on_info->oi_origdb;
2235         op2->o_request = op->o_request;
2236         op2->o_managedsait = op->o_managedsait;
2237         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2238         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2239
2240         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2241         if ( i ) {
2242                 op2->ors_attrs = (AttributeName *) ptr;
2243                 ptr = (char *) &op2->ors_attrs[i+1];
2244                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2245                         op2->ors_attrs[i] = op->ors_attrs[i];
2246                         op2->ors_attrs[i].an_name.bv_val = ptr;
2247                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2248                 }
2249                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2250         }
2251
2252         op2->o_authz = op->o_authz;
2253         op2->o_ndn.bv_val = ptr;
2254         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2255         op2->o_dn = op2->o_ndn;
2256         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2257         op2->o_req_dn.bv_val = ptr;
2258         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2259         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2260         op2->o_req_ndn.bv_val = ptr;
2261         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2262         op2->ors_filterstr.bv_val = ptr;
2263         strcpy( ptr, so->s_filterstr.bv_val );
2264         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2265
2266         /* Skip the AND/GE clause that we stuck on in front */
2267         if ( so->s_flags & PS_FIX_FILTER ) {
2268                 op2->ors_filter = op->ors_filter->f_and->f_next;
2269                 so->s_flags ^= PS_FIX_FILTER;
2270         } else {
2271                 op2->ors_filter = op->ors_filter;
2272         }
2273         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2274         so->s_op = op2;
2275
2276         /* Copy any cached group ACLs individually */
2277         op2->o_groups = NULL;
2278         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2279                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2280                 *g2 = *g1;
2281                 strcpy( g2->ga_ndn, g1->ga_ndn );
2282                 g2->ga_next = op2->o_groups;
2283                 op2->o_groups = g2;
2284         }
2285         /* Don't allow any further group caching */
2286         op2->o_do_not_cache = 1;
2287
2288         /* Add op2 to conn so abandon will find us */
2289         op->o_conn->c_n_ops_executing++;
2290         op->o_conn->c_n_ops_completed--;
2291         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2292         so->s_flags |= PS_IS_DETACHED;
2293
2294         /* Prevent anyone else from trying to send a result for this op */
2295         op->o_abandon = 1;
2296 }
2297
2298 static int
2299 syncprov_search_response( Operation *op, SlapReply *rs )
2300 {
2301         searchstate *ss = op->o_callback->sc_private;
2302         slap_overinst *on = ss->ss_on;
2303         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2304         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2305
2306         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2307                 Attribute *a;
2308                 /* If we got a referral without a referral object, there's
2309                  * something missing that we cannot replicate. Just ignore it.
2310                  * The consumer will abort because we didn't send the expected
2311                  * control.
2312                  */
2313                 if ( !rs->sr_entry ) {
2314                         assert( rs->sr_entry != NULL );
2315                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2316                         return SLAP_CB_CONTINUE;
2317                 }
2318                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2319                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2320                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2321                 }
2322                 if ( a ) {
2323                         int i, sid;
2324                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2325
2326                         /* Don't send changed entries back to the originator */
2327                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2328                                 Debug( LDAP_DEBUG_SYNC,
2329                                         "Entry %s changed by peer, ignored\n",
2330                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2331                                 return LDAP_SUCCESS;
2332                         }
2333
2334                         /* If not a persistent search */
2335                         if ( !ss->ss_so ) {
2336                                 /* Make sure entry is less than the snapshot'd contextCSN */
2337                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2338                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2339                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2340                                                 Debug( LDAP_DEBUG_SYNC,
2341                                                         "Entry %s CSN %s greater than snapshot %s\n",
2342                                                         rs->sr_entry->e_name.bv_val,
2343                                                         a->a_nvals[0].bv_val,
2344                                                         ss->ss_ctxcsn[i].bv_val );
2345                                                 return LDAP_SUCCESS;
2346                                         }
2347                                 }
2348                         }
2349
2350                         /* Don't send old entries twice */
2351                         if ( srs->sr_state.ctxcsn ) {
2352                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2353                                         if ( sid == srs->sr_state.sids[i] &&
2354                                                 ber_bvcmp( &a->a_nvals[0],
2355                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2356                                                 Debug( LDAP_DEBUG_SYNC,
2357                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2358                                                         rs->sr_entry->e_name.bv_val,
2359                                                         a->a_nvals[0].bv_val,
2360                                                         srs->sr_state.ctxcsn[i].bv_val );
2361                                                 return LDAP_SUCCESS;
2362                                         }
2363                                 }
2364                         }
2365                 }
2366                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2367                         op->o_tmpmemctx );
2368                 rs->sr_ctrls[1] = NULL;
2369                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2370                 /* If we're in delta-sync mode, always send a cookie */
2371                 if ( si->si_nopres && si->si_usehint && a ) {
2372                         struct berval cookie;
2373                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2374                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2375                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2376                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2377                 } else {
2378                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2379                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2380                 }
2381         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2382                 struct berval cookie = BER_BVNULL;
2383
2384                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2385                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2386                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2387                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2388
2389                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2390                 }
2391
2392                 /* Is this a regular refresh?
2393                  * Note: refresh never gets here if there were no changes
2394                  */
2395                 if ( !ss->ss_so ) {
2396                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2397                                 op->o_tmpmemctx );
2398                         rs->sr_ctrls[1] = NULL;
2399                         rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2400                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2401                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2402                                         LDAP_SYNC_REFRESH_DELETES );
2403                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2404                 } else {
2405                 /* It's RefreshAndPersist, transition to Persist phase */
2406                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2407                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2408                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2409                                 1, NULL, 0 );
2410                         if ( !BER_BVISNULL( &cookie ))
2411                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2412
2413                         /* Detach this Op from frontend control */
2414                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2415
2416                         /* But not if this connection was closed along the way */
2417                         if ( op->o_abandon ) {
2418                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2419                                 /* syncprov_ab_cleanup will free this syncop */
2420                                 return SLAPD_ABANDON;
2421
2422                         } else {
2423                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2424                                 /* Turn off the refreshing flag */
2425                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2426
2427                                 syncprov_detach_op( op, ss->ss_so, on );
2428
2429                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2430
2431                                 /* If there are queued responses, fire them off */
2432                                 if ( ss->ss_so->s_res )
2433                                         syncprov_qstart( ss->ss_so );
2434                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2435                         }
2436
2437                         return LDAP_SUCCESS;
2438                 }
2439         }
2440
2441         return SLAP_CB_CONTINUE;
2442 }
2443
2444 static int
2445 syncprov_op_search( Operation *op, SlapReply *rs )
2446 {
2447         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2448         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2449         slap_callback   *cb;
2450         int gotstate = 0, changed = 0, do_present = 0;
2451         syncops *sop = NULL;
2452         searchstate *ss;
2453         sync_control *srs;
2454         BerVarray ctxcsn;
2455         int i, *sids, numcsns;
2456         struct berval mincsn, maxcsn;
2457         int minsid, maxsid;
2458         int dirty = 0;
2459
2460         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2461
2462         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2463                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2464                 return rs->sr_err;
2465         }
2466
2467         srs = op->o_controls[slap_cids.sc_LDAPsync];
2468
2469         /* If this is a persistent search, set it up right away */
2470         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2471                 syncops so = {0};
2472                 fbase_cookie fc;
2473                 opcookie opc;
2474                 slap_callback sc;
2475
2476                 fc.fss = &so;
2477                 fc.fbase = 0;
2478                 so.s_eid = NOID;
2479                 so.s_op = op;
2480                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2481                 /* syncprov_findbase expects to be called as a callback... */
2482                 sc.sc_private = &opc;
2483                 opc.son = on;
2484                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2485                 cb = op->o_callback;
2486                 op->o_callback = &sc;
2487                 rs->sr_err = syncprov_findbase( op, &fc );
2488                 op->o_callback = cb;
2489                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2490
2491                 if ( rs->sr_err != LDAP_SUCCESS ) {
2492                         send_ldap_result( op, rs );
2493                         return rs->sr_err;
2494                 }
2495                 sop = ch_malloc( sizeof( syncops ));
2496                 *sop = so;
2497                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2498                 sop->s_rid = srs->sr_state.rid;
2499                 sop->s_sid = srs->sr_state.sid;
2500                 /* set refcount=2 to prevent being freed out from under us
2501                  * by abandons that occur while we're running here
2502                  */
2503                 sop->s_inuse = 2;
2504
2505                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2506                 while ( si->si_active ) {
2507                         /* Wait for active mods to finish before proceeding, as they
2508                          * may already have inspected the si_ops list looking for
2509                          * consumers to replicate the change to.  Using the log
2510                          * doesn't help, as we may finish playing it before the
2511                          * active mods gets added to it.
2512                          */
2513                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2514                         if ( slapd_shutdown ) {
2515                                 ch_free( sop );
2516                                 return SLAPD_ABANDON;
2517                         }
2518                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2519                                 ldap_pvt_thread_yield();
2520                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2521                 }
2522                 sop->s_next = si->si_ops;
2523                 sop->s_si = si;
2524                 si->si_ops = sop;
2525                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2526         }
2527
2528         /* snapshot the ctxcsn */
2529         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2530         numcsns = si->si_numcsns;
2531         if ( numcsns ) {
2532                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2533                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2534                 for ( i=0; i<numcsns; i++ )
2535                         sids[i] = si->si_sids[i];
2536         } else {
2537                 ctxcsn = NULL;
2538                 sids = NULL;
2539         }
2540         dirty = si->si_dirty;
2541         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2542
2543         /* If we have a cookie, handle the PRESENT lookups */
2544         if ( srs->sr_state.ctxcsn ) {
2545                 sessionlog *sl;
2546                 int i, j;
2547
2548                 /* If we don't have any CSN of our own yet, pretend nothing
2549                  * has changed.
2550                  */
2551                 if ( !numcsns )
2552                         goto no_change;
2553
2554                 if ( !si->si_nopres )
2555                         do_present = SS_PRESENT;
2556
2557                 /* If there are SIDs we don't recognize in the cookie, drop them */
2558                 for (i=0; i<srs->sr_state.numcsns; ) {
2559                         for (j=i; j<numcsns; j++) {
2560                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2561                                         break;
2562                                 }
2563                         }
2564                         /* not found */
2565                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2566                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2567                                 srs->sr_state.numcsns--;
2568                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2569                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2570                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2571                                 }
2572                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2573                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2574                                 continue;
2575                         }
2576                         i++;
2577                 }
2578
2579                 if (srs->sr_state.numcsns != numcsns) {
2580                         /* consumer doesn't have the right number of CSNs */
2581                         changed = SS_CHANGED;
2582                         if ( srs->sr_state.ctxcsn ) {
2583                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2584                                 srs->sr_state.ctxcsn = NULL;
2585                         }
2586                         if ( srs->sr_state.sids ) {
2587                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2588                                 srs->sr_state.sids = NULL;
2589                         }
2590                         srs->sr_state.numcsns = 0;
2591                         goto shortcut;
2592                 }
2593
2594                 /* Find the smallest CSN which differs from contextCSN */
2595                 mincsn.bv_len = 0;
2596                 maxcsn.bv_len = 0;
2597                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2598                         int newer;
2599                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2600                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2601                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2602                                 maxcsn = srs->sr_state.ctxcsn[i];
2603                                 maxsid = sids[j];
2604                         }
2605                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2606                         /* If our state is newer, tell consumer about changes */
2607                         if ( newer < 0) {
2608                                 changed = SS_CHANGED;
2609                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2610                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2611                                         mincsn = srs->sr_state.ctxcsn[i];
2612                                         minsid = sids[j];
2613                                 }
2614                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2615                         /* our state is older, complain to consumer */
2616                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2617                                 rs->sr_text = "consumer state is newer than provider!";
2618 bailout:
2619                                 if ( sop ) {
2620                                         syncops **sp = &si->si_ops;
2621
2622                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2623                                         while ( *sp != sop )
2624                                                 sp = &(*sp)->s_next;
2625                                         *sp = sop->s_next;
2626                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2627                                         ch_free( sop );
2628                                 }
2629                                 rs->sr_ctrls = NULL;
2630                                 send_ldap_result( op, rs );
2631                                 return rs->sr_err;
2632                         }
2633                 }
2634                 if ( BER_BVISEMPTY( &mincsn )) {
2635                         mincsn = maxcsn;
2636                         minsid = maxsid;
2637                 }
2638
2639                 /* If nothing has changed, shortcut it */
2640                 if ( !changed && !dirty ) {
2641                         do_present = 0;
2642 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2643                                 LDAPControl     *ctrls[2];
2644
2645                                 ctrls[0] = NULL;
2646                                 ctrls[1] = NULL;
2647                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2648                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2649                                 rs->sr_ctrls = ctrls;
2650                                 rs->sr_err = LDAP_SUCCESS;
2651                                 send_ldap_result( op, rs );
2652                                 rs->sr_ctrls = NULL;
2653                                 return rs->sr_err;
2654                         }
2655                         goto shortcut;
2656                 }
2657
2658                 /* Do we have a sessionlog for this search? */
2659                 sl=si->si_logs;
2660                 if ( sl ) {
2661                         int do_play = 0;
2662                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2663                         /* Are there any log entries, and is the consumer state
2664                          * present in the session log?
2665                          */
2666                         if ( sl->sl_num > 0 ) {
2667                                 int i;
2668                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2669                                         /* SID not present == new enough */
2670                                         if ( minsid < sl->sl_sids[i] ) {
2671                                                 do_play = 1;
2672                                                 break;
2673                                         }
2674                                         /* SID present */
2675                                         if ( minsid == sl->sl_sids[i] ) {
2676                                                 /* new enough? */
2677                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2678                                                         do_play = 1;
2679                                                 break;
2680                                         }
2681                                 }
2682                                 /* SID not present == new enough */
2683                                 if ( i == sl->sl_numcsns )
2684                                         do_play = 1;
2685                         }
2686                         if ( do_play ) {
2687                                 do_present = 0;
2688                                 /* mutex is unlocked in playlog */
2689                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2690                         } else {
2691                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2692                         }
2693                 }
2694                 /* Is the CSN still present in the database? */
2695                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2696                         /* No, so a reload is required */
2697                         /* the 2.2 consumer doesn't send this hint */
2698                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2699                                 if ( ctxcsn )
2700                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2701                                 if ( sids )
2702                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2703                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2704                                 rs->sr_text = "sync cookie is stale";
2705                                 goto bailout;
2706                         }
2707                         if ( srs->sr_state.ctxcsn ) {
2708                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2709                                 srs->sr_state.ctxcsn = NULL;
2710                         }
2711                         if ( srs->sr_state.sids ) {
2712                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2713                                 srs->sr_state.sids = NULL;
2714                         }
2715                         srs->sr_state.numcsns = 0;
2716                 } else {
2717                         gotstate = 1;
2718                         /* If changed and doing Present lookup, send Present UUIDs */
2719                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2720                                 LDAP_SUCCESS ) {
2721                                 if ( ctxcsn )
2722                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2723                                 if ( sids )
2724                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2725                                 goto bailout;
2726                         }
2727                 }
2728         } else {
2729                 /* No consumer state, assume something has changed */
2730                 changed = SS_CHANGED;
2731         }
2732
2733 shortcut:
2734         /* Append CSN range to search filter, save original filter
2735          * for persistent search evaluation
2736          */
2737         if ( sop ) {
2738                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2739                 sop->s_filterstr = op->ors_filterstr;
2740                 /* correct the refcount that was set to 2 before */
2741                 sop->s_inuse--;
2742         }
2743
2744         /* If something changed, find the changes */
2745         if ( gotstate && ( changed || dirty ) ) {
2746                 Filter *fand, *fava;
2747
2748                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2749                 fand->f_choice = LDAP_FILTER_AND;
2750                 fand->f_next = NULL;
2751                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2752                 fand->f_and = fava;
2753                 fava->f_choice = LDAP_FILTER_GE;
2754                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2755                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2756 #ifdef LDAP_COMP_MATCH
2757                 fava->f_ava->aa_cf = NULL;
2758 #endif
2759                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2760                 fava->f_next = op->ors_filter;
2761                 op->ors_filter = fand;
2762                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2763                 if ( sop ) {
2764                         sop->s_flags |= PS_FIX_FILTER;
2765                 }
2766         }
2767         if ( sop ) {
2768                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2769         }
2770
2771         /* Let our callback add needed info to returned entries */
2772         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2773         ss = (searchstate *)(cb+1);
2774         ss->ss_on = on;
2775         ss->ss_so = sop;
2776         ss->ss_flags = do_present | changed;
2777         ss->ss_ctxcsn = ctxcsn;
2778         ss->ss_numcsns = numcsns;
2779         ss->ss_sids = sids;
2780         cb->sc_response = syncprov_search_response;
2781         cb->sc_private = ss;
2782         cb->sc_next = op->o_callback;
2783         op->o_callback = cb;
2784
2785         /* If this is a persistent search and no changes were reported during
2786          * the refresh phase, just invoke the response callback to transition
2787          * us into persist phase
2788          */
2789         if ( !changed && !dirty ) {
2790                 rs->sr_err = LDAP_SUCCESS;
2791                 rs->sr_nentries = 0;
2792                 send_ldap_result( op, rs );
2793                 return rs->sr_err;
2794         }
2795         return SLAP_CB_CONTINUE;
2796 }
2797
2798 static int
2799 syncprov_operational(
2800         Operation *op,
2801         SlapReply *rs )
2802 {
2803         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2804         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2805
2806         /* This prevents generating unnecessarily; frontend will strip
2807          * any statically stored copy.
2808          */
2809         if ( op->o_sync != SLAP_CONTROL_NONE )
2810                 return SLAP_CB_CONTINUE;
2811
2812         if ( rs->sr_entry &&
2813                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2814
2815                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2816                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2817                         Attribute *a, **ap = NULL;
2818
2819                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2820                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2821                                         break;
2822                         }
2823
2824                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2825                         if ( si->si_ctxcsn ) {
2826                                 if ( !a ) {
2827                                         for ( ap = &rs->sr_operational_attrs; *ap;
2828                                                 ap=&(*ap)->a_next );
2829
2830                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2831                                         *ap = a;
2832                                 }
2833
2834                                 if ( !ap ) {
2835                                         if ( rs_entry2modifiable( op, rs, on )) {
2836                                                 a = attr_find( rs->sr_entry->e_attrs,
2837                                                         slap_schema.si_ad_contextCSN );
2838                                         }
2839                                         if ( a->a_nvals != a->a_vals ) {
2840                                                 ber_bvarray_free( a->a_nvals );
2841                                         }
2842                                         a->a_nvals = NULL;
2843                                         ber_bvarray_free( a->a_vals );
2844                                         a->a_vals = NULL;
2845                                         a->a_numvals = 0;
2846                                 }
2847                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2848                         }
2849                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2850                 }
2851         }
2852         return SLAP_CB_CONTINUE;
2853 }
2854
2855 enum {
2856         SP_CHKPT = 1,
2857         SP_SESSL,
2858         SP_NOPRES,
2859         SP_USEHINT
2860 };
2861
2862 static ConfigDriver sp_cf_gen;
2863
2864 static ConfigTable spcfg[] = {
2865         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2866                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2867                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2868                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2869         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2870                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2871                         "DESC 'Session log size in ops' "
2872                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2873         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2874                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2875                         "DESC 'Omit Present phase processing' "
2876                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2877         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2878                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2879                         "DESC 'Observe Reload Hint in Request control' "
2880                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2881         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2882 };
2883
2884 static ConfigOCs spocs[] = {
2885         { "( OLcfgOvOc:1.1 "
2886                 "NAME 'olcSyncProvConfig' "
2887                 "DESC 'SyncRepl Provider configuration' "
2888                 "SUP olcOverlayConfig "
2889                 "MAY ( olcSpCheckpoint "
2890                         "$ olcSpSessionlog "
2891                         "$ olcSpNoPresent "
2892                         "$ olcSpReloadHint "
2893                 ") )",
2894                         Cft_Overlay, spcfg },
2895         { NULL, 0, NULL }
2896 };
2897
2898 static int
2899 sp_cf_gen(ConfigArgs *c)
2900 {
2901         slap_overinst           *on = (slap_overinst *)c->bi;
2902         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2903         int rc = 0;
2904
2905         if ( c->op == SLAP_CONFIG_EMIT ) {
2906                 switch ( c->type ) {
2907                 case SP_CHKPT:
2908                         if ( si->si_chkops || si->si_chktime ) {
2909                                 struct berval bv;
2910                                 /* we assume si_chktime is a multiple of 60
2911                                  * because the parsed value was originally
2912                                  * multiplied by 60 */
2913                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2914                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2915                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2916                                         rc = 1;
2917                                 } else {
2918                                         bv.bv_val = c->cr_msg;
2919                                         value_add_one( &c->rvalue_vals, &bv );
2920                                 }
2921                         } else {
2922                                 rc = 1;
2923                         }
2924                         break;
2925                 case SP_SESSL:
2926                         if ( si->si_logs ) {
2927                                 c->value_int = si->si_logs->sl_size;
2928                         } else {
2929                                 rc = 1;
2930                         }
2931                         break;
2932                 case SP_NOPRES:
2933                         if ( si->si_nopres ) {
2934                                 c->value_int = 1;
2935                         } else {
2936                                 rc = 1;
2937                         }
2938                         break;
2939                 case SP_USEHINT:
2940                         if ( si->si_usehint ) {
2941                                 c->value_int = 1;
2942                         } else {
2943                                 rc = 1;
2944                         }
2945                         break;
2946                 }
2947                 return rc;
2948         } else if ( c->op == LDAP_MOD_DELETE ) {
2949                 switch ( c->type ) {
2950                 case SP_CHKPT:
2951                         si->si_chkops = 0;
2952                         si->si_chktime = 0;
2953                         break;
2954                 case SP_SESSL:
2955                         if ( si->si_logs )
2956                                 si->si_logs->sl_size = 0;
2957                         else
2958                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2959                         break;
2960                 case SP_NOPRES:
2961                         if ( si->si_nopres )
2962                                 si->si_nopres = 0;
2963                         else
2964                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2965                         break;
2966                 case SP_USEHINT:
2967                         if ( si->si_usehint )
2968                                 si->si_usehint = 0;
2969                         else
2970                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2971                         break;
2972                 }
2973                 return rc;
2974         }
2975         switch ( c->type ) {
2976         case SP_CHKPT:
2977                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2978                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2979                                 c->argv[0], c->argv[1] );
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                 if ( si->si_chkops <= 0 ) {
2985                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2986                                 c->argv[0], si->si_chkops );
2987                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2988                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2989                         return ARG_BAD_CONF;
2990                 }
2991                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2992                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2993                                 c->argv[0], c->argv[1] );
2994                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2995                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2996                         return ARG_BAD_CONF;
2997                 }
2998                 if ( si->si_chktime <= 0 ) {
2999                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
3000                                 c->argv[0], si->si_chkops );
3001                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3002                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3003                         return ARG_BAD_CONF;
3004                 }
3005                 si->si_chktime *= 60;
3006                 break;
3007         case SP_SESSL: {
3008                 sessionlog *sl;
3009                 int size = c->value_int;
3010
3011                 if ( size < 0 ) {
3012                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
3013                                 c->argv[0], size );
3014                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3015                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3016                         return ARG_BAD_CONF;
3017                 }
3018                 sl = si->si_logs;
3019                 if ( !sl ) {
3020                         sl = ch_malloc( sizeof( sessionlog ));
3021                         sl->sl_mincsn = NULL;
3022                         sl->sl_sids = NULL;
3023                         sl->sl_num = 0;
3024                         sl->sl_numcsns = 0;
3025                         sl->sl_head = sl->sl_tail = NULL;
3026                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
3027                         si->si_logs = sl;
3028                 }
3029                 sl->sl_size = size;
3030                 }
3031                 break;
3032         case SP_NOPRES:
3033                 si->si_nopres = c->value_int;
3034                 break;
3035         case SP_USEHINT:
3036                 si->si_usehint = c->value_int;
3037                 break;
3038         }
3039         return rc;
3040 }
3041
3042 /* ITS#3456 we cannot run this search on the main thread, must use a
3043  * child thread in order to insure we have a big enough stack.
3044  */
3045 static void *
3046 syncprov_db_otask(
3047         void *ptr
3048 )
3049 {
3050         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3051         return NULL;
3052 }
3053
3054
3055 /* Read any existing contextCSN from the underlying db.
3056  * Then search for any entries newer than that. If no value exists,
3057  * just generate it. Cache whatever result.
3058  */
3059 static int
3060 syncprov_db_open(
3061         BackendDB *be,
3062         ConfigReply *cr
3063 )
3064 {
3065         slap_overinst   *on = (slap_overinst *) be->bd_info;
3066         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3067
3068         Connection conn = { 0 };
3069         OperationBuffer opbuf;
3070         Operation *op;
3071         Entry *e = NULL;
3072         Attribute *a;
3073         int rc;
3074         void *thrctx = NULL;
3075
3076         if ( !SLAP_LASTMOD( be )) {
3077                 Debug( LDAP_DEBUG_ANY,
3078                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3079                 return -1;
3080         }
3081
3082         if ( slapMode & SLAP_TOOL_MODE ) {
3083                 return 0;
3084         }
3085
3086         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3087         if ( rc ) {
3088                 return rc;
3089         }
3090
3091         thrctx = ldap_pvt_thread_pool_context();
3092         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3093         op = &opbuf.ob_op;
3094         op->o_bd = be;
3095         op->o_dn = be->be_rootdn;
3096         op->o_ndn = be->be_rootndn;
3097
3098         if ( SLAP_SYNC_SUBENTRY( be )) {
3099                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3100                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3101         } else {
3102                 si->si_contextdn = be->be_nsuffix[0];
3103         }
3104         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3105                 slap_schema.si_ad_contextCSN, 0, &e, on );
3106
3107         if ( e ) {
3108                 ldap_pvt_thread_t tid;
3109
3110                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3111                 if ( a ) {
3112                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3113                         si->si_numcsns = a->a_numvals;
3114                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3115                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3116                 }
3117                 overlay_entry_release_ov( op, e, 0, on );
3118                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3119                         op->o_tag = LDAP_REQ_SEARCH;
3120                         op->o_req_dn = be->be_suffix[0];
3121                         op->o_req_ndn = be->be_nsuffix[0];
3122                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3123                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3124                         ldap_pvt_thread_join( tid, NULL );
3125                 }
3126         }
3127
3128         /* Didn't find a contextCSN, should we generate one? */
3129         if ( !si->si_ctxcsn ) {
3130                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3131                 struct berval csn;
3132
3133                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
3134                 /* If we're also a consumer, then don't generate anything.
3135                  * Wait for our provider to send it to us, or for a local
3136                  * modify if we have multimaster.
3137                  */
3138                         goto out;
3139                 }
3140                 csn.bv_val = csnbuf;
3141                 csn.bv_len = sizeof( csnbuf );
3142                 slap_get_csn( op, &csn, 0 );
3143                 value_add_one( &si->si_ctxcsn, &csn );
3144                 si->si_numcsns = 1;
3145                 si->si_sids = ch_malloc( sizeof(int) );
3146                 si->si_sids[0] = slap_serverID;
3147
3148                 /* make sure we do a checkpoint on close */
3149                 si->si_numops++;
3150         }
3151
3152         /* Initialize the sessionlog mincsn */
3153         if ( si->si_logs && si->si_numcsns ) {
3154                 sessionlog *sl = si->si_logs;
3155                 int i;
3156                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3157                 sl->sl_numcsns = si->si_numcsns;
3158                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3159                 for ( i=0; i < si->si_numcsns; i++ )
3160                         sl->sl_sids[i] = si->si_sids[i];
3161         }
3162
3163 out:
3164         op->o_bd->bd_info = (BackendInfo *)on;
3165         return 0;
3166 }
3167
3168 /* Write the current contextCSN into the underlying db.
3169  */
3170 static int
3171 syncprov_db_close(
3172         BackendDB *be,
3173         ConfigReply *cr
3174 )
3175 {
3176     slap_overinst   *on = (slap_overinst *) be->bd_info;
3177     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3178 #ifdef SLAP_CONFIG_DELETE
3179         syncops *so, *sonext;
3180 #endif /* SLAP_CONFIG_DELETE */
3181
3182         if ( slapMode & SLAP_TOOL_MODE ) {
3183                 return 0;
3184         }
3185         if ( si->si_numops ) {
3186                 Connection conn = {0};
3187                 OperationBuffer opbuf;
3188                 Operation *op;
3189                 void *thrctx;
3190
3191                 thrctx = ldap_pvt_thread_pool_context();
3192                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3193                 op = &opbuf.ob_op;
3194                 op->o_bd = be;
3195                 op->o_dn = be->be_rootdn;
3196                 op->o_ndn = be->be_rootndn;
3197                 syncprov_checkpoint( op, on );
3198         }
3199
3200 #ifdef SLAP_CONFIG_DELETE
3201         if ( !slapd_shutdown ) {
3202                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
3203                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3204                         SlapReply rs = {REP_RESULT};
3205                         rs.sr_err = LDAP_UNAVAILABLE;
3206                         send_ldap_result( so->s_op, &rs );
3207                         sonext=so->s_next;
3208                         syncprov_drop_psearch( so, 0);
3209                 }
3210                 si->si_ops=NULL;
3211                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
3212         }
3213         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3214 #endif /* SLAP_CONFIG_DELETE */
3215
3216     return 0;
3217 }
3218
3219 static int
3220 syncprov_db_init(
3221         BackendDB *be,
3222         ConfigReply *cr
3223 )
3224 {
3225         slap_overinst   *on = (slap_overinst *)be->bd_info;
3226         syncprov_info_t *si;
3227
3228         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3229                 Debug( LDAP_DEBUG_ANY,
3230                         "syncprov must be instantiated within a database.\n",
3231                         0, 0, 0 );
3232                 return 1;
3233         }
3234
3235         si = ch_calloc(1, sizeof(syncprov_info_t));
3236         on->on_bi.bi_private = si;
3237         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3238         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3239         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3240         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3241
3242         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3243         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3244         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3245         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3246
3247         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3248         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3249
3250         return 0;
3251 }
3252
3253 static int
3254 syncprov_db_destroy(
3255         BackendDB *be,
3256         ConfigReply *cr
3257 )
3258 {
3259         slap_overinst   *on = (slap_overinst *)be->bd_info;
3260         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3261
3262         if ( si ) {
3263                 if ( si->si_logs ) {
3264                         sessionlog *sl = si->si_logs;
3265                         slog_entry *se = sl->sl_head;
3266
3267                         while ( se ) {
3268                                 slog_entry *se_next = se->se_next;
3269                                 ch_free( se );
3270                                 se = se_next;
3271                         }
3272                         if ( sl->sl_mincsn )
3273                                 ber_bvarray_free( sl->sl_mincsn );
3274                         if ( sl->sl_sids )
3275                                 ch_free( sl->sl_sids );
3276
3277                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3278                         ch_free( si->si_logs );
3279                 }
3280                 if ( si->si_ctxcsn )
3281                         ber_bvarray_free( si->si_ctxcsn );
3282                 if ( si->si_sids )
3283                         ch_free( si->si_sids );
3284                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3285                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3286                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3287                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3288                 ch_free( si );
3289         }
3290
3291         return 0;
3292 }
3293
3294 static int syncprov_parseCtrl (
3295         Operation *op,
3296         SlapReply *rs,
3297         LDAPControl *ctrl )
3298 {
3299         ber_tag_t tag;
3300         BerElementBuffer berbuf;
3301         BerElement *ber = (BerElement *)&berbuf;
3302         ber_int_t mode;
3303         ber_len_t len;
3304         struct berval cookie = BER_BVNULL;
3305         sync_control *sr;
3306         int rhint = 0;
3307
3308         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3309                 rs->sr_text = "Sync control specified multiple times";
3310                 return LDAP_PROTOCOL_ERROR;
3311         }
3312
3313         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3314                 rs->sr_text = "Sync control specified with pagedResults control";
3315                 return LDAP_PROTOCOL_ERROR;
3316         }
3317
3318         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3319                 rs->sr_text = "Sync control value is absent";
3320                 return LDAP_PROTOCOL_ERROR;
3321         }
3322
3323         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3324                 rs->sr_text = "Sync control value is empty";
3325                 return LDAP_PROTOCOL_ERROR;
3326         }
3327
3328         /* Parse the control value
3329          *      syncRequestValue ::= SEQUENCE {
3330          *              mode   ENUMERATED {
3331          *                      -- 0 unused
3332          *                      refreshOnly             (1),
3333          *                      -- 2 reserved
3334          *                      refreshAndPersist       (3)
3335          *              },
3336          *              cookie  syncCookie OPTIONAL
3337          *      }
3338          */
3339
3340         ber_init2( ber, &ctrl->ldctl_value, 0 );
3341
3342         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3343                 rs->sr_text = "Sync control : mode decoding error";
3344                 return LDAP_PROTOCOL_ERROR;
3345         }
3346
3347         switch( mode ) {
3348         case LDAP_SYNC_REFRESH_ONLY:
3349                 mode = SLAP_SYNC_REFRESH;
3350                 break;
3351         case LDAP_SYNC_REFRESH_AND_PERSIST:
3352                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3353                 break;
3354         default:
3355                 rs->sr_text = "Sync control : unknown update mode";
3356                 return LDAP_PROTOCOL_ERROR;
3357         }
3358
3359         tag = ber_peek_tag( ber, &len );
3360
3361         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3362                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3363                         rs->sr_text = "Sync control : cookie decoding error";
3364                         return LDAP_PROTOCOL_ERROR;
3365                 }
3366                 tag = ber_peek_tag( ber, &len );
3367         }
3368         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3369                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3370                         rs->sr_text = "Sync control : rhint decoding error";
3371                         return LDAP_PROTOCOL_ERROR;
3372                 }
3373         }
3374         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3375                         rs->sr_text = "Sync control : decoding error";
3376                         return LDAP_PROTOCOL_ERROR;
3377         }
3378         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3379         sr->sr_rhint = rhint;
3380         if (!BER_BVISNULL(&cookie)) {
3381                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3382                 /* If parse fails, pretend no cookie was sent */
3383                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3384                         sr->sr_state.rid == -1 ) {
3385                         if ( sr->sr_state.ctxcsn ) {
3386                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3387                                 sr->sr_state.ctxcsn = NULL;
3388                         }
3389                         sr->sr_state.numcsns = 0;
3390                 }
3391         }
3392
3393         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3394
3395         op->o_sync = ctrl->ldctl_iscritical
3396                 ? SLAP_CONTROL_CRITICAL
3397                 : SLAP_CONTROL_NONCRITICAL;
3398
3399         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3400
3401         return LDAP_SUCCESS;
3402 }
3403
3404 /* This overlay is set up for dynamic loading via moduleload. For static
3405  * configuration, you'll need to arrange for the slap_overinst to be
3406  * initialized and registered by some other function inside slapd.
3407  */
3408
3409 static slap_overinst            syncprov;
3410
3411 int
3412 syncprov_initialize()
3413 {
3414         int rc;
3415
3416         rc = register_supported_control( LDAP_CONTROL_SYNC,
3417                 SLAP_CTRL_SEARCH, NULL,
3418                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3419         if ( rc != LDAP_SUCCESS ) {
3420                 Debug( LDAP_DEBUG_ANY,
3421                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3422                 return rc;
3423         }
3424
3425         syncprov.on_bi.bi_type = "syncprov";
3426         syncprov.on_bi.bi_db_init = syncprov_db_init;
3427         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3428         syncprov.on_bi.bi_db_open = syncprov_db_open;
3429         syncprov.on_bi.bi_db_close = syncprov_db_close;
3430
3431         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3432         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3433
3434         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3435         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3436         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3437         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3438         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3439         syncprov.on_bi.bi_op_search = syncprov_op_search;
3440         syncprov.on_bi.bi_extended = syncprov_op_extended;
3441         syncprov.on_bi.bi_operational = syncprov_operational;
3442
3443         syncprov.on_bi.bi_cf_ocs = spocs;
3444
3445         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3446
3447         rc = config_register_schema( spcfg, spocs );
3448         if ( rc ) return rc;
3449
3450         return overlay_register( &syncprov );
3451 }
3452
3453 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3454 int
3455 init_module( int argc, char *argv[] )
3456 {
3457         return syncprov_initialize();
3458 }
3459 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3460
3461 #endif /* defined(SLAPD_OVER_SYNCPROV) */