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 2004-2017 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                 modinst *mi = (modinst *)(opc+1), **m2;
1420                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1421                 for (m2 = &mt->mt_mods; ; m2 = &(*m2)->mi_next) {
1422                         if ( *m2 == mi ) {
1423                                 *m2 = mi->mi_next;
1424                                 if ( mt->mt_tail == mi )
1425                                         mt->mt_tail = ( m2 == &mt->mt_mods ) ? NULL : (modinst *)m2;
1426                                 break;
1427                         }
1428                 }
1429                 /* If there are more, promote the next one */
1430                 if ( mt->mt_mods ) {
1431                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1432                 } else {
1433                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1434                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1435                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1436                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1437                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1438                         ch_free( mt->mt_dn.bv_val );
1439                         ch_free( mt );
1440                 }
1441         }
1442         if ( !BER_BVISNULL( &opc->suuid ))
1443                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1444         if ( !BER_BVISNULL( &opc->sndn ))
1445                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1446         if ( !BER_BVISNULL( &opc->sdn ))
1447                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1448         op->o_callback = cb->sc_next;
1449         op->o_tmpfree(cb, op->o_tmpmemctx);
1450
1451         return 0;
1452 }
1453
1454 static void
1455 syncprov_checkpoint( Operation *op, slap_overinst *on )
1456 {
1457         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1458         Modifications mod;
1459         Operation opm;
1460         SlapReply rsm = {REP_RESULT};
1461         slap_callback cb = {0};
1462         BackendDB be;
1463         BackendInfo *bi;
1464
1465 #ifdef CHECK_CSN
1466         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1467
1468         int i;
1469         for ( i=0; i<si->si_numcsns; i++ ) {
1470                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1471         }
1472 #endif
1473         mod.sml_numvals = si->si_numcsns;
1474         mod.sml_values = si->si_ctxcsn;
1475         mod.sml_nvalues = NULL;
1476         mod.sml_desc = slap_schema.si_ad_contextCSN;
1477         mod.sml_op = LDAP_MOD_REPLACE;
1478         mod.sml_flags = SLAP_MOD_INTERNAL;
1479         mod.sml_next = NULL;
1480
1481         cb.sc_response = slap_null_cb;
1482         opm = *op;
1483         opm.o_tag = LDAP_REQ_MODIFY;
1484         opm.o_callback = &cb;
1485         opm.orm_modlist = &mod;
1486         opm.orm_no_opattrs = 1;
1487         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1488                 be = *on->on_info->oi_origdb;
1489                 opm.o_bd = &be;
1490         }
1491         opm.o_req_dn = si->si_contextdn;
1492         opm.o_req_ndn = si->si_contextdn;
1493         bi = opm.o_bd->bd_info;
1494         opm.o_bd->bd_info = on->on_info->oi_orig;
1495         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1496         opm.o_no_schema_check = 1;
1497         opm.o_opid = -1;
1498         opm.o_bd->be_modify( &opm, &rsm );
1499
1500         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1501                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1502                 const char      *text;
1503                 char txtbuf[SLAP_TEXT_BUFLEN];
1504                 size_t textlen = sizeof txtbuf;
1505                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1506                 rs_reinit( &rsm, REP_RESULT );
1507                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1508                 opm.ora_e = e;
1509                 opm.o_bd->be_add( &opm, &rsm );
1510                 if ( e == opm.ora_e )
1511                         be_entry_release_w( &opm, opm.ora_e );
1512         }
1513         opm.o_bd->bd_info = bi;
1514
1515         if ( mod.sml_next != NULL ) {
1516                 slap_mods_free( mod.sml_next, 1 );
1517         }
1518 #ifdef CHECK_CSN
1519         for ( i=0; i<si->si_numcsns; i++ ) {
1520                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1521         }
1522 #endif
1523 }
1524
1525 static void
1526 syncprov_add_slog( Operation *op )
1527 {
1528         opcookie *opc = op->o_callback->sc_private;
1529         slap_overinst *on = opc->son;
1530         syncprov_info_t         *si = on->on_bi.bi_private;
1531         sessionlog *sl;
1532         slog_entry *se;
1533
1534         sl = si->si_logs;
1535         {
1536                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1537                         /* During the syncrepl refresh phase we can receive operations
1538                          * without a csn.  We cannot reliably determine the consumers
1539                          * state with respect to such operations, so we ignore them and
1540                          * wipe out anything in the log if we see them.
1541                          */
1542                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1543                         while ( se = sl->sl_head ) {
1544                                 sl->sl_head = se->se_next;
1545                                 ch_free( se );
1546                         }
1547                         sl->sl_tail = NULL;
1548                         sl->sl_num = 0;
1549                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1550                         return;
1551                 }
1552
1553                 /* Allocate a record. UUIDs are not NUL-terminated. */
1554                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1555                         op->o_csn.bv_len + 1 );
1556                 se->se_next = NULL;
1557                 se->se_tag = op->o_tag;
1558
1559                 se->se_uuid.bv_val = (char *)(&se[1]);
1560                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1561                 se->se_uuid.bv_len = opc->suuid.bv_len;
1562
1563                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1564                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1565                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1566                 se->se_csn.bv_len = op->o_csn.bv_len;
1567                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1568
1569                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1570                 if ( sl->sl_head ) {
1571                         /* Keep the list in csn order. */
1572                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1573                                 sl->sl_tail->se_next = se;
1574                                 sl->sl_tail = se;
1575                         } else {
1576                                 slog_entry **sep;
1577
1578                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1579                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1580                                                 se->se_next = *sep;
1581                                                 *sep = se;
1582                                                 break;
1583                                         }
1584                                 }
1585                         }
1586                 } else {
1587                         sl->sl_head = se;
1588                         sl->sl_tail = se;
1589                         if ( !sl->sl_mincsn ) {
1590                                 sl->sl_numcsns = 1;
1591                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1592                                 sl->sl_sids = ch_malloc( sizeof( int ));
1593                                 sl->sl_sids[0] = se->se_sid;
1594                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1595                                 BER_BVZERO( &sl->sl_mincsn[1] );
1596                         }
1597                 }
1598                 sl->sl_num++;
1599                 while ( sl->sl_num > sl->sl_size ) {
1600                         int i, j;
1601                         se = sl->sl_head;
1602                         sl->sl_head = se->se_next;
1603                         for ( i=0; i<sl->sl_numcsns; i++ )
1604                                 if ( sl->sl_sids[i] >= se->se_sid )
1605                                         break;
1606                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1607                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1608                                         i, se->se_sid, &se->se_csn );
1609                         } else {
1610                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1611                         }
1612                         ch_free( se );
1613                         sl->sl_num--;
1614                 }
1615                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1616         }
1617 }
1618
1619 /* Just set a flag if we found the matching entry */
1620 static int
1621 playlog_cb( Operation *op, SlapReply *rs )
1622 {
1623         if ( rs->sr_type == REP_SEARCH ) {
1624                 op->o_callback->sc_private = (void *)1;
1625         }
1626         return rs->sr_err;
1627 }
1628
1629 /* enter with sl->sl_mutex locked, release before returning */
1630 static void
1631 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1632         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1633 {
1634         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1635         slog_entry *se;
1636         int i, j, ndel, num, nmods, mmods;
1637         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1638         BerVarray uuids;
1639         struct berval delcsn[2];
1640
1641         if ( !sl->sl_num ) {
1642                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1643                 return;
1644         }
1645
1646         num = sl->sl_num;
1647         i = 0;
1648         nmods = 0;
1649
1650         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1651                 num * UUID_LEN, op->o_tmpmemctx );
1652         uuids[0].bv_val = (char *)(uuids + num + 1);
1653
1654         delcsn[0].bv_len = 0;
1655         delcsn[0].bv_val = cbuf;
1656         BER_BVZERO(&delcsn[1]);
1657
1658         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1659          * and everything else at the end. Do this first so we can
1660          * unlock the list mutex.
1661          */
1662         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1663                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1664         for ( se=sl->sl_head; se; se=se->se_next ) {
1665                 int k;
1666                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1667                 ndel = 1;
1668                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1669                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1670                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1671                                 break;
1672                         }
1673                 }
1674                 if ( ndel <= 0 ) {
1675                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1676                         continue;
1677                 }
1678                 ndel = 0;
1679                 for ( k=0; k<numcsns; k++ ) {
1680                         if ( se->se_sid == sids[k] ) {
1681                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1682                                 break;
1683                         }
1684                 }
1685                 if ( ndel > 0 ) {
1686                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1687                         break;
1688                 }
1689                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1690                         j = i;
1691                         i++;
1692                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1693                         delcsn[0].bv_len = se->se_csn.bv_len;
1694                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1695                 } else {
1696                         if ( se->se_tag == LDAP_REQ_ADD )
1697                                 continue;
1698                         nmods++;
1699                         j = num - nmods;
1700                 }
1701                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1702                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1703                 uuids[j].bv_len = UUID_LEN;
1704         }
1705         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1706
1707         ndel = i;
1708
1709         /* Zero out unused slots */
1710         for ( i=ndel; i < num - nmods; i++ )
1711                 uuids[i].bv_len = 0;
1712
1713         /* Mods must be validated to see if they belong in this delete set.
1714          */
1715
1716         mmods = nmods;
1717         /* Strip any duplicates */
1718         for ( i=0; i<nmods; i++ ) {
1719                 for ( j=0; j<ndel; j++ ) {
1720                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1721                                 uuids[num - 1 - i].bv_len = 0;
1722                                 mmods --;
1723                                 break;
1724                         }
1725                 }
1726                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1727                 for ( j=0; j<i; j++ ) {
1728                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1729                                 uuids[num - 1 - i].bv_len = 0;
1730                                 mmods --;
1731                                 break;
1732                         }
1733                 }
1734         }
1735
1736         if ( mmods ) {
1737                 Operation fop;
1738                 int rc;
1739                 Filter mf, af;
1740                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1741                 slap_callback cb = {0};
1742
1743                 fop = *op;
1744
1745                 fop.o_sync_mode = 0;
1746                 fop.o_callback = &cb;
1747                 fop.ors_limit = NULL;
1748                 fop.ors_tlimit = SLAP_NO_LIMIT;
1749                 fop.ors_attrs = slap_anlist_all_attributes;
1750                 fop.ors_attrsonly = 0;
1751                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1752
1753                 af.f_choice = LDAP_FILTER_AND;
1754                 af.f_next = NULL;
1755                 af.f_and = &mf;
1756                 mf.f_choice = LDAP_FILTER_EQUALITY;
1757                 mf.f_ava = &eq;
1758                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1759                 mf.f_next = fop.ors_filter;
1760
1761                 fop.ors_filter = &af;
1762
1763                 cb.sc_response = playlog_cb;
1764                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1765
1766                 for ( i=ndel; i<num; i++ ) {
1767                   if ( uuids[i].bv_len != 0 ) {
1768                         SlapReply frs = { REP_RESULT };
1769
1770                         mf.f_av_value = uuids[i];
1771                         cb.sc_private = NULL;
1772                         fop.ors_slimit = 1;
1773                         rc = fop.o_bd->be_search( &fop, &frs );
1774
1775                         /* If entry was not found, add to delete list */
1776                         if ( !cb.sc_private ) {
1777                                 uuids[ndel++] = uuids[i];
1778                         }
1779                   }
1780                 }
1781                 fop.o_bd->bd_info = (BackendInfo *)on;
1782         }
1783         if ( ndel ) {
1784                 struct berval cookie;
1785
1786                 if ( delcsn[0].bv_len ) {
1787                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1788                                 slap_serverID ? slap_serverID : -1 );
1789
1790                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1791                 }
1792
1793                 uuids[ndel].bv_val = NULL;
1794                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1795                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1796                 if ( delcsn[0].bv_len ) {
1797                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1798                 }
1799         }
1800         op->o_tmpfree( uuids, op->o_tmpmemctx );
1801 }
1802
1803 static int
1804 syncprov_op_response( Operation *op, SlapReply *rs )
1805 {
1806         opcookie *opc = op->o_callback->sc_private;
1807         slap_overinst *on = opc->son;
1808         syncprov_info_t         *si = on->on_bi.bi_private;
1809         syncmatches *sm;
1810
1811         if ( rs->sr_err == LDAP_SUCCESS )
1812         {
1813                 struct berval maxcsn;
1814                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1815                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1816
1817                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1818
1819                 /* Update our context CSN */
1820                 cbuf[0] = '\0';
1821                 maxcsn.bv_val = cbuf;
1822                 maxcsn.bv_len = sizeof(cbuf);
1823                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1824
1825                 slap_get_commit_csn( op, &maxcsn, &foundit );
1826                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1827                         /* syncrepl queues the CSN values in the db where
1828                          * it is configured , not where the changes are made.
1829                          * So look for a value in the glue db if we didn't
1830                          * find any in this db.
1831                          */
1832                         BackendDB *be = op->o_bd;
1833                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1834                         maxcsn.bv_val = cbuf;
1835                         maxcsn.bv_len = sizeof(cbuf);
1836                         slap_get_commit_csn( op, &maxcsn, &foundit );
1837                         op->o_bd = be;
1838                 }
1839                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1840                         int i, sid;
1841 #ifdef CHECK_CSN
1842                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1843                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1844 #endif
1845                         sid = slap_parse_csn_sid( &maxcsn );
1846                         for ( i=0; i<si->si_numcsns; i++ ) {
1847                                 if ( sid < si->si_sids[i] )
1848                                         break;
1849                                 if ( sid == si->si_sids[i] ) {
1850                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1851                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1852                                                 csn_changed = 1;
1853                                         }
1854                                         break;
1855                                 }
1856                         }
1857                         /* It's a new SID for us */
1858                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1859                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1860                                         i, sid, &maxcsn );
1861                                 csn_changed = 1;
1862                         }
1863                 }
1864
1865                 /* Don't do any processing for consumer contextCSN updates */
1866                 if ( op->o_dont_replicate ) {
1867                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1868                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1869                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1870                         /* Catch contextCSN updates from syncrepl. We have to look at
1871                          * all the attribute values, as there may be more than one csn
1872                          * that changed, and only one can be passed in the csn queue.
1873                          */
1874                         Modifications *mod = op->orm_modlist;
1875                         unsigned i;
1876                         int j, sid;
1877
1878                         for ( i=0; i<mod->sml_numvals; i++ ) {
1879                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1880                                 for ( j=0; j<si->si_numcsns; j++ ) {
1881                                         if ( sid < si->si_sids[j] )
1882                                                 break;
1883                                         if ( sid == si->si_sids[j] ) {
1884                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1885                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1886                                                         csn_changed = 1;
1887                                                 }
1888                                                 break;
1889                                         }
1890                                 }
1891
1892                                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1893                                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1894                                                 j, sid, &mod->sml_values[i] );
1895                                         csn_changed = 1;
1896                                 }
1897                         }
1898                         if ( csn_changed )
1899                                 si->si_dirty = 0;
1900                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1901
1902                         if ( csn_changed ) {
1903                                 syncops *ss;
1904                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1905                                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1906                                         if ( ss->s_op->o_abandon )
1907                                                 continue;
1908                                         /* Send the updated csn to all syncrepl consumers,
1909                                          * including the server from which it originated.
1910                                          * The syncrepl consumer and syncprov provider on
1911                                          * the originating server may be configured to store
1912                                          * their csn values in different entries.
1913                                          */
1914                                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1915                                 }
1916                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1917                         }
1918                         } else {
1919                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1920                         }
1921                         if ( csn_changed )
1922                                 si->si_numops++;
1923                         goto leave;
1924                 }
1925
1926                 if ( csn_changed )
1927                         si->si_numops++;
1928                 if ( si->si_chkops || si->si_chktime ) {
1929                         /* Never checkpoint adding the context entry,
1930                          * it will deadlock
1931                          */
1932                         if ( op->o_tag != LDAP_REQ_ADD ||
1933                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1934                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1935                                         do_check = 1;
1936                                         si->si_numops = 0;
1937                                 }
1938                                 if ( si->si_chktime &&
1939                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1940                                         if ( si->si_chklast ) {
1941                                                 do_check = 1;
1942                                                 si->si_chklast = op->o_time;
1943                                         } else {
1944                                                 si->si_chklast = 1;
1945                                         }
1946                                 }
1947                         }
1948                 }
1949                 si->si_dirty = !csn_changed;
1950                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1951
1952                 if ( do_check ) {
1953                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1954                         syncprov_checkpoint( op, on );
1955                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1956                 }
1957
1958                 /* only update consumer ctx if this is a newer csn */
1959                 if ( csn_changed ) {
1960                         opc->sctxcsn = maxcsn;
1961                 }
1962
1963                 /* Handle any persistent searches */
1964                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1965                 have_psearches = ( si->si_ops != NULL );
1966                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1967                 if ( have_psearches ) {
1968                         switch(op->o_tag) {
1969                         case LDAP_REQ_ADD:
1970                         case LDAP_REQ_MODIFY:
1971                         case LDAP_REQ_MODRDN:
1972                         case LDAP_REQ_EXTENDED:
1973                                 syncprov_matchops( op, opc, 0 );
1974                                 break;
1975                         case LDAP_REQ_DELETE:
1976                                 /* for each match in opc->smatches:
1977                                  *   send DELETE msg
1978                                  */
1979                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1980                                         if ( sm->sm_op->s_op->o_abandon )
1981                                                 continue;
1982                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1983                                 }
1984                                 if ( opc->ssres.s_info )
1985                                         free_resinfo( &opc->ssres );
1986                                 break;
1987                         }
1988                 }
1989
1990                 /* Add any log records */
1991                 if ( si->si_logs ) {
1992                         syncprov_add_slog( op );
1993                 }
1994 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1995         }
1996         return SLAP_CB_CONTINUE;
1997 }
1998
1999 /* We don't use a subentry to store the context CSN any more.
2000  * We expose the current context CSN as an operational attribute
2001  * of the suffix entry.
2002  */
2003 static int
2004 syncprov_op_compare( Operation *op, SlapReply *rs )
2005 {
2006         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2007         syncprov_info_t         *si = on->on_bi.bi_private;
2008         int rc = SLAP_CB_CONTINUE;
2009
2010         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
2011                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
2012         {
2013                 Entry e = {0};
2014                 Attribute a = {0};
2015
2016                 e.e_name = si->si_contextdn;
2017                 e.e_nname = si->si_contextdn;
2018                 e.e_attrs = &a;
2019
2020                 a.a_desc = slap_schema.si_ad_contextCSN;
2021
2022                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2023
2024                 a.a_vals = si->si_ctxcsn;
2025                 a.a_nvals = a.a_vals;
2026                 a.a_numvals = si->si_numcsns;
2027
2028                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
2029                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
2030                 if ( ! rs->sr_err ) {
2031                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
2032                         goto return_results;
2033                 }
2034
2035                 if ( get_assert( op ) &&
2036                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
2037                 {
2038                         rs->sr_err = LDAP_ASSERTION_FAILED;
2039                         goto return_results;
2040                 }
2041
2042
2043                 rs->sr_err = LDAP_COMPARE_FALSE;
2044
2045                 if ( attr_valfind( &a,
2046                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2047                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2048                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2049                 {
2050                         rs->sr_err = LDAP_COMPARE_TRUE;
2051                 }
2052
2053 return_results:;
2054
2055                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2056
2057                 send_ldap_result( op, rs );
2058
2059                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2060                         rs->sr_err = LDAP_SUCCESS;
2061                 }
2062                 rc = rs->sr_err;
2063         }
2064
2065         return rc;
2066 }
2067
2068 static int
2069 syncprov_op_mod( Operation *op, SlapReply *rs )
2070 {
2071         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2072         syncprov_info_t         *si = on->on_bi.bi_private;
2073         slap_callback *cb;
2074         opcookie *opc;
2075         int have_psearches, cbsize;
2076
2077         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2078         have_psearches = ( si->si_ops != NULL );
2079         si->si_active++;
2080         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2081
2082         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2083                 (have_psearches ? sizeof(modinst) : 0 );
2084
2085         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2086         opc = (opcookie *)(cb+1);
2087         opc->son = on;
2088         cb->sc_response = syncprov_op_response;
2089         cb->sc_cleanup = syncprov_op_cleanup;
2090         cb->sc_private = opc;
2091         cb->sc_next = op->o_callback;
2092         op->o_callback = cb;
2093
2094         opc->osid = -1;
2095         opc->rsid = -1;
2096         if ( op->o_csn.bv_val ) {
2097                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2098         }
2099         if ( op->o_controls ) {
2100                 struct sync_cookie *scook =
2101                 op->o_controls[slap_cids.sc_LDAPsync];
2102                 if ( scook )
2103                         opc->rsid = scook->sid;
2104         }
2105
2106         if ( op->o_dont_replicate )
2107                 return SLAP_CB_CONTINUE;
2108
2109         /* If there are active persistent searches, lock this operation.
2110          * See seqmod.c for the locking logic on its own.
2111          */
2112         if ( have_psearches ) {
2113                 modtarget *mt, mtdummy;
2114                 modinst *mi;
2115
2116                 mi = (modinst *)(opc+1);
2117                 mi->mi_op = op;
2118
2119                 /* See if we're already modifying this entry... */
2120                 mtdummy.mt_dn = op->o_req_ndn;
2121 retry:
2122                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2123                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2124                 if ( mt ) {
2125                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2126                         if ( mt->mt_mods == NULL ) {
2127                                 /* Cannot reuse this mt, as another thread is about
2128                                  * to release it in syncprov_op_cleanup. Wait for them
2129                                  * to finish; our own insert is required to succeed.
2130                                  */
2131                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2132                                 ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2133                                 ldap_pvt_thread_yield();
2134                                 goto retry;
2135                         }
2136                 }
2137                 if ( mt ) {
2138                         mt->mt_tail->mi_next = mi;
2139                         mt->mt_tail = mi;
2140                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2141                         /* wait for this op to get to head of list */
2142                         while ( mt->mt_mods != mi ) {
2143                                 modinst *m2;
2144                                 /* don't wait on other mods from the same thread */
2145                                 for ( m2 = mt->mt_mods; m2; m2 = m2->mi_next ) {
2146                                         if ( m2->mi_op->o_threadctx == op->o_threadctx ) {
2147                                                 break;
2148                                         }
2149                                 }
2150                                 if ( m2 )
2151                                         break;
2152
2153                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2154                                 /* FIXME: if dynamic config can delete overlays or
2155                                  * databases we'll have to check for cleanup here.
2156                                  * Currently it's not an issue because there are
2157                                  * no dynamic config deletes...
2158                                  */
2159                                 if ( slapd_shutdown )
2160                                         return SLAPD_ABANDON;
2161
2162                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2163                                         ldap_pvt_thread_yield();
2164                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2165
2166                                 /* clean up if the caller is giving up */
2167                                 if ( op->o_abandon ) {
2168                                         modinst **m2;
2169                                         slap_callback **sc;
2170                                         for (m2 = &mt->mt_mods; ; m2 = &(*m2)->mi_next) {
2171                                                 if ( *m2 == mi ) {
2172                                                         *m2 = mi->mi_next;
2173                                                         if ( mt->mt_tail == mi )
2174                                                                 mt->mt_tail = ( m2 == &mt->mt_mods ) ? NULL : (modinst *)m2;
2175                                                         break;
2176                                                 }
2177                                         }
2178                                         for (sc = &op->o_callback; ; sc = &(*sc)->sc_next) {
2179                                                 if ( *sc == cb ) {
2180                                                         *sc = cb->sc_next;
2181                                                         break;
2182                                                 }
2183                                         }
2184                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2185                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2186                                         return SLAPD_ABANDON;
2187                                 }
2188                         }
2189                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2190                 } else {
2191                         /* Record that we're modifying this entry now */
2192                         mt = ch_malloc( sizeof(modtarget) );
2193                         mt->mt_mods = mi;
2194                         mt->mt_tail = mi;
2195                         ber_dupbv( &mt->mt_dn, &mi->mi_op->o_req_ndn );
2196                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2197                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2198                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2199                 }
2200                 opc->smt = mt;
2201         }
2202
2203         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2204                 syncprov_matchops( op, opc, 1 );
2205
2206         return SLAP_CB_CONTINUE;
2207 }
2208
2209 static int
2210 syncprov_op_extended( Operation *op, SlapReply *rs )
2211 {
2212         if ( exop_is_write( op ))
2213                 return syncprov_op_mod( op, rs );
2214
2215         return SLAP_CB_CONTINUE;
2216 }
2217
2218 typedef struct searchstate {
2219         slap_overinst *ss_on;
2220         syncops *ss_so;
2221         BerVarray ss_ctxcsn;
2222         int *ss_sids;
2223         int ss_numcsns;
2224 #define SS_PRESENT      0x01
2225 #define SS_CHANGED      0x02
2226         int ss_flags;
2227 } searchstate;
2228
2229 typedef struct SyncOperationBuffer {
2230         Operation               sob_op;
2231         Opheader                sob_hdr;
2232         OpExtra                 sob_oe;
2233         AttributeName   sob_extra;      /* not always present */
2234         /* Further data allocated here */
2235 } SyncOperationBuffer;
2236
2237 static void
2238 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2239 {
2240         SyncOperationBuffer *sopbuf2;
2241         Operation *op2;
2242         int i, alen = 0;
2243         size_t size;
2244         char *ptr;
2245         GroupAssertion *g1, *g2;
2246
2247         /* count the search attrs */
2248         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2249                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2250         }
2251         /* Make a new copy of the operation */
2252         size = offsetof( SyncOperationBuffer, sob_extra ) +
2253                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2254                 op->o_req_dn.bv_len + 1 +
2255                 op->o_req_ndn.bv_len + 1 +
2256                 op->o_ndn.bv_len + 1 +
2257                 so->s_filterstr.bv_len + 1;
2258         sopbuf2 = ch_calloc( 1, size );
2259         op2 = &sopbuf2->sob_op;
2260         op2->o_hdr = &sopbuf2->sob_hdr;
2261         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2262
2263         /* Copy the fields we care about explicitly, leave the rest alone */
2264         *op2->o_hdr = *op->o_hdr;
2265         op2->o_tag = op->o_tag;
2266         op2->o_time = op->o_time;
2267         op2->o_bd = on->on_info->oi_origdb;
2268         op2->o_request = op->o_request;
2269         op2->o_managedsait = op->o_managedsait;
2270         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2271         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2272
2273         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2274         if ( i ) {
2275                 op2->ors_attrs = (AttributeName *) ptr;
2276                 ptr = (char *) &op2->ors_attrs[i+1];
2277                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2278                         op2->ors_attrs[i] = op->ors_attrs[i];
2279                         op2->ors_attrs[i].an_name.bv_val = ptr;
2280                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2281                 }
2282                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2283         }
2284
2285         op2->o_authz = op->o_authz;
2286         op2->o_ndn.bv_val = ptr;
2287         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2288         op2->o_dn = op2->o_ndn;
2289         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2290         op2->o_req_dn.bv_val = ptr;
2291         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2292         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2293         op2->o_req_ndn.bv_val = ptr;
2294         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2295         op2->ors_filterstr.bv_val = ptr;
2296         strcpy( ptr, so->s_filterstr.bv_val );
2297         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2298
2299         /* Skip the AND/GE clause that we stuck on in front */
2300         if ( so->s_flags & PS_FIX_FILTER ) {
2301                 op2->ors_filter = op->ors_filter->f_and->f_next;
2302                 so->s_flags ^= PS_FIX_FILTER;
2303         } else {
2304                 op2->ors_filter = op->ors_filter;
2305         }
2306         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2307         so->s_op = op2;
2308
2309         /* Copy any cached group ACLs individually */
2310         op2->o_groups = NULL;
2311         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2312                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2313                 *g2 = *g1;
2314                 strcpy( g2->ga_ndn, g1->ga_ndn );
2315                 g2->ga_next = op2->o_groups;
2316                 op2->o_groups = g2;
2317         }
2318         /* Don't allow any further group caching */
2319         op2->o_do_not_cache = 1;
2320
2321         /* Add op2 to conn so abandon will find us */
2322         op->o_conn->c_n_ops_executing++;
2323         op->o_conn->c_n_ops_completed--;
2324         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2325         so->s_flags |= PS_IS_DETACHED;
2326
2327         /* Prevent anyone else from trying to send a result for this op */
2328         op->o_abandon = 1;
2329 }
2330
2331 static int
2332 syncprov_search_response( Operation *op, SlapReply *rs )
2333 {
2334         searchstate *ss = op->o_callback->sc_private;
2335         slap_overinst *on = ss->ss_on;
2336         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2337         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2338
2339         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2340                 Attribute *a;
2341                 /* If we got a referral without a referral object, there's
2342                  * something missing that we cannot replicate. Just ignore it.
2343                  * The consumer will abort because we didn't send the expected
2344                  * control.
2345                  */
2346                 if ( !rs->sr_entry ) {
2347                         assert( rs->sr_entry != NULL );
2348                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2349                         return SLAP_CB_CONTINUE;
2350                 }
2351                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2352                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2353                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2354                 }
2355                 if ( a ) {
2356                         int i, sid;
2357                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2358
2359                         /* Don't send changed entries back to the originator */
2360                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2361                                 Debug( LDAP_DEBUG_SYNC,
2362                                         "Entry %s changed by peer, ignored\n",
2363                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2364                                 return LDAP_SUCCESS;
2365                         }
2366
2367                         /* If not a persistent search */
2368                         if ( !ss->ss_so ) {
2369                                 /* Make sure entry is less than the snapshot'd contextCSN */
2370                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2371                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2372                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2373                                                 Debug( LDAP_DEBUG_SYNC,
2374                                                         "Entry %s CSN %s greater than snapshot %s\n",
2375                                                         rs->sr_entry->e_name.bv_val,
2376                                                         a->a_nvals[0].bv_val,
2377                                                         ss->ss_ctxcsn[i].bv_val );
2378                                                 return LDAP_SUCCESS;
2379                                         }
2380                                 }
2381                         }
2382
2383                         /* Don't send old entries twice */
2384                         if ( srs->sr_state.ctxcsn ) {
2385                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2386                                         if ( sid == srs->sr_state.sids[i] &&
2387                                                 ber_bvcmp( &a->a_nvals[0],
2388                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2389                                                 Debug( LDAP_DEBUG_SYNC,
2390                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2391                                                         rs->sr_entry->e_name.bv_val,
2392                                                         a->a_nvals[0].bv_val,
2393                                                         srs->sr_state.ctxcsn[i].bv_val );
2394                                                 return LDAP_SUCCESS;
2395                                         }
2396                                 }
2397                         }
2398                 }
2399                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2400                         op->o_tmpmemctx );
2401                 rs->sr_ctrls[1] = NULL;
2402                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2403                 /* If we're in delta-sync mode, always send a cookie */
2404                 if ( si->si_nopres && si->si_usehint && a ) {
2405                         struct berval cookie;
2406                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2407                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2408                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2409                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2410                 } else {
2411                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2412                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2413                 }
2414         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2415                 struct berval cookie = BER_BVNULL;
2416
2417                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2418                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2419                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2420                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2421
2422                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2423                 }
2424
2425                 /* Is this a regular refresh?
2426                  * Note: refresh never gets here if there were no changes
2427                  */
2428                 if ( !ss->ss_so ) {
2429                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2430                                 op->o_tmpmemctx );
2431                         rs->sr_ctrls[1] = NULL;
2432                         rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2433                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2434                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2435                                         LDAP_SYNC_REFRESH_DELETES );
2436                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2437                 } else {
2438                 /* It's RefreshAndPersist, transition to Persist phase */
2439                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2440                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2441                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2442                                 1, NULL, 0 );
2443                         if ( !BER_BVISNULL( &cookie ))
2444                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2445
2446                         /* Detach this Op from frontend control */
2447                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2448
2449                         /* But not if this connection was closed along the way */
2450                         if ( op->o_abandon ) {
2451                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2452                                 /* syncprov_ab_cleanup will free this syncop */
2453                                 return SLAPD_ABANDON;
2454
2455                         } else {
2456                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2457                                 /* Turn off the refreshing flag */
2458                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2459
2460                                 syncprov_detach_op( op, ss->ss_so, on );
2461
2462                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2463
2464                                 /* If there are queued responses, fire them off */
2465                                 if ( ss->ss_so->s_res )
2466                                         syncprov_qstart( ss->ss_so );
2467                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2468                         }
2469
2470                         return LDAP_SUCCESS;
2471                 }
2472         }
2473
2474         return SLAP_CB_CONTINUE;
2475 }
2476
2477 static int
2478 syncprov_op_search( Operation *op, SlapReply *rs )
2479 {
2480         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2481         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2482         slap_callback   *cb;
2483         int gotstate = 0, changed = 0, do_present = 0;
2484         syncops *sop = NULL;
2485         searchstate *ss;
2486         sync_control *srs;
2487         BerVarray ctxcsn;
2488         int i, *sids, numcsns;
2489         struct berval mincsn, maxcsn;
2490         int minsid, maxsid;
2491         int dirty = 0;
2492
2493         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2494
2495         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2496                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2497                 return rs->sr_err;
2498         }
2499
2500         srs = op->o_controls[slap_cids.sc_LDAPsync];
2501
2502         /* If this is a persistent search, set it up right away */
2503         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2504                 syncops so = {0};
2505                 fbase_cookie fc;
2506                 opcookie opc;
2507                 slap_callback sc = {0};
2508
2509                 fc.fss = &so;
2510                 fc.fbase = 0;
2511                 so.s_eid = NOID;
2512                 so.s_op = op;
2513                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2514                 /* syncprov_findbase expects to be called as a callback... */
2515                 sc.sc_private = &opc;
2516                 opc.son = on;
2517                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2518                 cb = op->o_callback;
2519                 op->o_callback = &sc;
2520                 rs->sr_err = syncprov_findbase( op, &fc );
2521                 op->o_callback = cb;
2522                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2523
2524                 if ( rs->sr_err != LDAP_SUCCESS ) {
2525                         send_ldap_result( op, rs );
2526                         return rs->sr_err;
2527                 }
2528                 sop = ch_malloc( sizeof( syncops ));
2529                 *sop = so;
2530                 sop->s_rid = srs->sr_state.rid;
2531                 sop->s_sid = srs->sr_state.sid;
2532                 /* set refcount=2 to prevent being freed out from under us
2533                  * by abandons that occur while we're running here
2534                  */
2535                 sop->s_inuse = 2;
2536
2537                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2538                 while ( si->si_active ) {
2539                         /* Wait for active mods to finish before proceeding, as they
2540                          * may already have inspected the si_ops list looking for
2541                          * consumers to replicate the change to.  Using the log
2542                          * doesn't help, as we may finish playing it before the
2543                          * active mods gets added to it.
2544                          */
2545                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2546                         if ( slapd_shutdown ) {
2547                                 ch_free( sop );
2548                                 return SLAPD_ABANDON;
2549                         }
2550                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2551                                 ldap_pvt_thread_yield();
2552                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2553                 }
2554                 if ( op->o_abandon ) {
2555                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2556                         ch_free( sop );
2557                         return SLAPD_ABANDON;
2558                 }
2559                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2560                 sop->s_next = si->si_ops;
2561                 sop->s_si = si;
2562                 si->si_ops = sop;
2563                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2564         }
2565
2566         /* snapshot the ctxcsn
2567          * Note: this must not be done before the psearch setup. (ITS#8365)
2568          */
2569         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2570         numcsns = si->si_numcsns;
2571         if ( numcsns ) {
2572                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2573                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2574                 for ( i=0; i<numcsns; i++ )
2575                         sids[i] = si->si_sids[i];
2576         } else {
2577                 ctxcsn = NULL;
2578                 sids = NULL;
2579         }
2580         dirty = si->si_dirty;
2581         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2582
2583         /* If we have a cookie, handle the PRESENT lookups */
2584         if ( srs->sr_state.ctxcsn ) {
2585                 sessionlog *sl;
2586                 int i, j;
2587
2588                 /* If we don't have any CSN of our own yet, bail out.
2589                  */
2590                 if ( !numcsns ) {
2591                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2592                         rs->sr_text = "consumer has state info but provider doesn't!";
2593                         goto bailout;
2594                 }
2595
2596                 if ( !si->si_nopres )
2597                         do_present = SS_PRESENT;
2598
2599                 /* If there are SIDs we don't recognize in the cookie, drop them */
2600                 for (i=0; i<srs->sr_state.numcsns; ) {
2601                         for (j=i; j<numcsns; j++) {
2602                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2603                                         break;
2604                                 }
2605                         }
2606                         /* not found */
2607                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2608                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2609                                 srs->sr_state.numcsns--;
2610                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2611                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2612                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2613                                 }
2614                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2615                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2616                                 continue;
2617                         }
2618                         i++;
2619                 }
2620
2621                 if (srs->sr_state.numcsns != numcsns) {
2622                         /* consumer doesn't have the right number of CSNs */
2623                         changed = SS_CHANGED;
2624                         if ( srs->sr_state.ctxcsn ) {
2625                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2626                                 srs->sr_state.ctxcsn = NULL;
2627                         }
2628                         if ( srs->sr_state.sids ) {
2629                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2630                                 srs->sr_state.sids = NULL;
2631                         }
2632                         srs->sr_state.numcsns = 0;
2633                         goto shortcut;
2634                 }
2635
2636                 /* Find the smallest CSN which differs from contextCSN */
2637                 mincsn.bv_len = 0;
2638                 maxcsn.bv_len = 0;
2639                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2640                         int newer;
2641                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2642                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2643                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2644                                 maxcsn = srs->sr_state.ctxcsn[i];
2645                                 maxsid = sids[j];
2646                         }
2647                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2648                         /* If our state is newer, tell consumer about changes */
2649                         if ( newer < 0) {
2650                                 changed = SS_CHANGED;
2651                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2652                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2653                                         mincsn = srs->sr_state.ctxcsn[i];
2654                                         minsid = sids[j];
2655                                 }
2656                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2657                         /* our state is older, complain to consumer */
2658                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2659                                 rs->sr_text = "consumer state is newer than provider!";
2660 bailout:
2661                                 if ( sop ) {
2662                                         syncops **sp = &si->si_ops;
2663
2664                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2665                                         while ( *sp != sop )
2666                                                 sp = &(*sp)->s_next;
2667                                         *sp = sop->s_next;
2668                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2669                                         ch_free( sop );
2670                                 }
2671                                 rs->sr_ctrls = NULL;
2672                                 send_ldap_result( op, rs );
2673                                 return rs->sr_err;
2674                         }
2675                 }
2676                 if ( BER_BVISEMPTY( &mincsn )) {
2677                         mincsn = maxcsn;
2678                         minsid = maxsid;
2679                 }
2680
2681                 /* If nothing has changed, shortcut it */
2682                 if ( !changed && !dirty ) {
2683                         do_present = 0;
2684 no_change:      if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2685                                 LDAPControl     *ctrls[2];
2686
2687                                 ctrls[0] = NULL;
2688                                 ctrls[1] = NULL;
2689                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2690                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2691                                 rs->sr_ctrls = ctrls;
2692                                 rs->sr_err = LDAP_SUCCESS;
2693                                 send_ldap_result( op, rs );
2694                                 rs->sr_ctrls = NULL;
2695                                 return rs->sr_err;
2696                         }
2697                         goto shortcut;
2698                 }
2699
2700                 /* Do we have a sessionlog for this search? */
2701                 sl=si->si_logs;
2702                 if ( sl ) {
2703                         int do_play = 0;
2704                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2705                         /* Are there any log entries, and is the consumer state
2706                          * present in the session log?
2707                          */
2708                         if ( sl->sl_num > 0 ) {
2709                                 int i;
2710                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2711                                         /* SID not present == new enough */
2712                                         if ( minsid < sl->sl_sids[i] ) {
2713                                                 do_play = 1;
2714                                                 break;
2715                                         }
2716                                         /* SID present */
2717                                         if ( minsid == sl->sl_sids[i] ) {
2718                                                 /* new enough? */
2719                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2720                                                         do_play = 1;
2721                                                 break;
2722                                         }
2723                                 }
2724                                 /* SID not present == new enough */
2725                                 if ( i == sl->sl_numcsns )
2726                                         do_play = 1;
2727                         }
2728                         if ( do_play ) {
2729                                 do_present = 0;
2730                                 /* mutex is unlocked in playlog */
2731                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2732                         } else {
2733                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2734                         }
2735                 }
2736                 /* Is the CSN still present in the database? */
2737                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2738                         /* No, so a reload is required */
2739                         /* the 2.2 consumer doesn't send this hint */
2740                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2741                                 if ( ctxcsn )
2742                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2743                                 if ( sids )
2744                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2745                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2746                                 rs->sr_text = "sync cookie is stale";
2747                                 goto bailout;
2748                         }
2749                         if ( srs->sr_state.ctxcsn ) {
2750                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2751                                 srs->sr_state.ctxcsn = NULL;
2752                         }
2753                         if ( srs->sr_state.sids ) {
2754                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2755                                 srs->sr_state.sids = NULL;
2756                         }
2757                         srs->sr_state.numcsns = 0;
2758                 } else {
2759                         gotstate = 1;
2760                         /* If changed and doing Present lookup, send Present UUIDs */
2761                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2762                                 LDAP_SUCCESS ) {
2763                                 if ( ctxcsn )
2764                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2765                                 if ( sids )
2766                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2767                                 goto bailout;
2768                         }
2769                 }
2770         } else {
2771                 /* The consumer knows nothing, we know nothing. OK. */
2772                 if (!numcsns)
2773                         goto no_change;
2774                 /* No consumer state, assume something has changed */
2775                 changed = SS_CHANGED;
2776         }
2777
2778 shortcut:
2779         /* Append CSN range to search filter, save original filter
2780          * for persistent search evaluation
2781          */
2782         if ( sop ) {
2783                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2784                 sop->s_filterstr = op->ors_filterstr;
2785                 /* correct the refcount that was set to 2 before */
2786                 sop->s_inuse--;
2787         }
2788
2789         /* If something changed, find the changes */
2790         if ( gotstate && ( changed || dirty ) ) {
2791                 Filter *fand, *fava;
2792
2793                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2794                 fand->f_choice = LDAP_FILTER_AND;
2795                 fand->f_next = NULL;
2796                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2797                 fand->f_and = fava;
2798                 fava->f_choice = LDAP_FILTER_GE;
2799                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2800                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2801 #ifdef LDAP_COMP_MATCH
2802                 fava->f_ava->aa_cf = NULL;
2803 #endif
2804                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2805                 fava->f_next = op->ors_filter;
2806                 op->ors_filter = fand;
2807                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2808                 if ( sop ) {
2809                         sop->s_flags |= PS_FIX_FILTER;
2810                 }
2811         }
2812         if ( sop ) {
2813                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2814         }
2815
2816         /* Let our callback add needed info to returned entries */
2817         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2818         ss = (searchstate *)(cb+1);
2819         ss->ss_on = on;
2820         ss->ss_so = sop;
2821         ss->ss_flags = do_present | changed;
2822         ss->ss_ctxcsn = ctxcsn;
2823         ss->ss_numcsns = numcsns;
2824         ss->ss_sids = sids;
2825         cb->sc_response = syncprov_search_response;
2826         cb->sc_private = ss;
2827         cb->sc_next = op->o_callback;
2828         op->o_callback = cb;
2829
2830         /* If this is a persistent search and no changes were reported during
2831          * the refresh phase, just invoke the response callback to transition
2832          * us into persist phase
2833          */
2834         if ( !changed && !dirty ) {
2835                 rs->sr_err = LDAP_SUCCESS;
2836                 rs->sr_nentries = 0;
2837                 send_ldap_result( op, rs );
2838                 return rs->sr_err;
2839         }
2840         return SLAP_CB_CONTINUE;
2841 }
2842
2843 static int
2844 syncprov_operational(
2845         Operation *op,
2846         SlapReply *rs )
2847 {
2848         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2849         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2850
2851         /* This prevents generating unnecessarily; frontend will strip
2852          * any statically stored copy.
2853          */
2854         if ( op->o_sync != SLAP_CONTROL_NONE )
2855                 return SLAP_CB_CONTINUE;
2856
2857         if ( rs->sr_entry &&
2858                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2859
2860                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2861                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2862                         Attribute *a, **ap = NULL;
2863
2864                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2865                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2866                                         break;
2867                         }
2868
2869                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2870                         if ( si->si_ctxcsn ) {
2871                                 if ( !a ) {
2872                                         for ( ap = &rs->sr_operational_attrs; *ap;
2873                                                 ap=&(*ap)->a_next );
2874
2875                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2876                                         *ap = a;
2877                                 }
2878
2879                                 if ( !ap ) {
2880                                         if ( rs_entry2modifiable( op, rs, on )) {
2881                                                 a = attr_find( rs->sr_entry->e_attrs,
2882                                                         slap_schema.si_ad_contextCSN );
2883                                         }
2884                                         if ( a->a_nvals != a->a_vals ) {
2885                                                 ber_bvarray_free( a->a_nvals );
2886                                         }
2887                                         a->a_nvals = NULL;
2888                                         ber_bvarray_free( a->a_vals );
2889                                         a->a_vals = NULL;
2890                                         a->a_numvals = 0;
2891                                 }
2892                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2893                         }
2894                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2895                 }
2896         }
2897         return SLAP_CB_CONTINUE;
2898 }
2899
2900 enum {
2901         SP_CHKPT = 1,
2902         SP_SESSL,
2903         SP_NOPRES,
2904         SP_USEHINT
2905 };
2906
2907 static ConfigDriver sp_cf_gen;
2908
2909 static ConfigTable spcfg[] = {
2910         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2911                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2912                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2913                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2914         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2915                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2916                         "DESC 'Session log size in ops' "
2917                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2918         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2919                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2920                         "DESC 'Omit Present phase processing' "
2921                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2922         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2923                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2924                         "DESC 'Observe Reload Hint in Request control' "
2925                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2926         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2927 };
2928
2929 static ConfigOCs spocs[] = {
2930         { "( OLcfgOvOc:1.1 "
2931                 "NAME 'olcSyncProvConfig' "
2932                 "DESC 'SyncRepl Provider configuration' "
2933                 "SUP olcOverlayConfig "
2934                 "MAY ( olcSpCheckpoint "
2935                         "$ olcSpSessionlog "
2936                         "$ olcSpNoPresent "
2937                         "$ olcSpReloadHint "
2938                 ") )",
2939                         Cft_Overlay, spcfg },
2940         { NULL, 0, NULL }
2941 };
2942
2943 static int
2944 sp_cf_gen(ConfigArgs *c)
2945 {
2946         slap_overinst           *on = (slap_overinst *)c->bi;
2947         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2948         int rc = 0;
2949
2950         if ( c->op == SLAP_CONFIG_EMIT ) {
2951                 switch ( c->type ) {
2952                 case SP_CHKPT:
2953                         if ( si->si_chkops || si->si_chktime ) {
2954                                 struct berval bv;
2955                                 /* we assume si_chktime is a multiple of 60
2956                                  * because the parsed value was originally
2957                                  * multiplied by 60 */
2958                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2959                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2960                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2961                                         rc = 1;
2962                                 } else {
2963                                         bv.bv_val = c->cr_msg;
2964                                         value_add_one( &c->rvalue_vals, &bv );
2965                                 }
2966                         } else {
2967                                 rc = 1;
2968                         }
2969                         break;
2970                 case SP_SESSL:
2971                         if ( si->si_logs ) {
2972                                 c->value_int = si->si_logs->sl_size;
2973                         } else {
2974                                 rc = 1;
2975                         }
2976                         break;
2977                 case SP_NOPRES:
2978                         if ( si->si_nopres ) {
2979                                 c->value_int = 1;
2980                         } else {
2981                                 rc = 1;
2982                         }
2983                         break;
2984                 case SP_USEHINT:
2985                         if ( si->si_usehint ) {
2986                                 c->value_int = 1;
2987                         } else {
2988                                 rc = 1;
2989                         }
2990                         break;
2991                 }
2992                 return rc;
2993         } else if ( c->op == LDAP_MOD_DELETE ) {
2994                 switch ( c->type ) {
2995                 case SP_CHKPT:
2996                         si->si_chkops = 0;
2997                         si->si_chktime = 0;
2998                         break;
2999                 case SP_SESSL:
3000                         if ( si->si_logs )
3001                                 si->si_logs->sl_size = 0;
3002                         else
3003                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
3004                         break;
3005                 case SP_NOPRES:
3006                         if ( si->si_nopres )
3007                                 si->si_nopres = 0;
3008                         else
3009                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
3010                         break;
3011                 case SP_USEHINT:
3012                         if ( si->si_usehint )
3013                                 si->si_usehint = 0;
3014                         else
3015                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
3016                         break;
3017                 }
3018                 return rc;
3019         }
3020         switch ( c->type ) {
3021         case SP_CHKPT:
3022                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
3023                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
3024                                 c->argv[0], c->argv[1] );
3025                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3026                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3027                         return ARG_BAD_CONF;
3028                 }
3029                 if ( si->si_chkops <= 0 ) {
3030                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
3031                                 c->argv[0], si->si_chkops );
3032                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3033                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3034                         return ARG_BAD_CONF;
3035                 }
3036                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
3037                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
3038                                 c->argv[0], c->argv[1] );
3039                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3040                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3041                         return ARG_BAD_CONF;
3042                 }
3043                 if ( si->si_chktime <= 0 ) {
3044                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
3045                                 c->argv[0], si->si_chkops );
3046                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3047                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3048                         return ARG_BAD_CONF;
3049                 }
3050                 si->si_chktime *= 60;
3051                 break;
3052         case SP_SESSL: {
3053                 sessionlog *sl;
3054                 int size = c->value_int;
3055
3056                 if ( size < 0 ) {
3057                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
3058                                 c->argv[0], size );
3059                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3060                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3061                         return ARG_BAD_CONF;
3062                 }
3063                 sl = si->si_logs;
3064                 if ( !sl ) {
3065                         sl = ch_malloc( sizeof( sessionlog ));
3066                         sl->sl_mincsn = NULL;
3067                         sl->sl_sids = NULL;
3068                         sl->sl_num = 0;
3069                         sl->sl_numcsns = 0;
3070                         sl->sl_head = sl->sl_tail = NULL;
3071                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
3072                         si->si_logs = sl;
3073                 }
3074                 sl->sl_size = size;
3075                 }
3076                 break;
3077         case SP_NOPRES:
3078                 si->si_nopres = c->value_int;
3079                 break;
3080         case SP_USEHINT:
3081                 si->si_usehint = c->value_int;
3082                 break;
3083         }
3084         return rc;
3085 }
3086
3087 /* ITS#3456 we cannot run this search on the main thread, must use a
3088  * child thread in order to insure we have a big enough stack.
3089  */
3090 static void *
3091 syncprov_db_otask(
3092         void *ptr
3093 )
3094 {
3095         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3096         return NULL;
3097 }
3098
3099
3100 /* Read any existing contextCSN from the underlying db.
3101  * Then search for any entries newer than that. If no value exists,
3102  * just generate it. Cache whatever result.
3103  */
3104 static int
3105 syncprov_db_open(
3106         BackendDB *be,
3107         ConfigReply *cr
3108 )
3109 {
3110         slap_overinst   *on = (slap_overinst *) be->bd_info;
3111         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3112
3113         Connection conn = { 0 };
3114         OperationBuffer opbuf;
3115         Operation *op;
3116         Entry *e = NULL;
3117         Attribute *a;
3118         int rc;
3119         void *thrctx = NULL;
3120
3121         if ( !SLAP_LASTMOD( be )) {
3122                 Debug( LDAP_DEBUG_ANY,
3123                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3124                 return -1;
3125         }
3126
3127         if ( slapMode & SLAP_TOOL_MODE ) {
3128                 return 0;
3129         }
3130
3131         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3132         if ( rc ) {
3133                 return rc;
3134         }
3135
3136         thrctx = ldap_pvt_thread_pool_context();
3137         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3138         op = &opbuf.ob_op;
3139         op->o_bd = be;
3140         op->o_dn = be->be_rootdn;
3141         op->o_ndn = be->be_rootndn;
3142
3143         if ( SLAP_SYNC_SUBENTRY( be )) {
3144                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3145                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3146         } else {
3147                 si->si_contextdn = be->be_nsuffix[0];
3148         }
3149         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3150                 slap_schema.si_ad_contextCSN, 0, &e, on );
3151
3152         if ( e ) {
3153                 ldap_pvt_thread_t tid;
3154
3155                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3156                 if ( a ) {
3157                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3158                         si->si_numcsns = a->a_numvals;
3159                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3160                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3161                 }
3162                 overlay_entry_release_ov( op, e, 0, on );
3163                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3164                         op->o_tag = LDAP_REQ_SEARCH;
3165                         op->o_req_dn = be->be_suffix[0];
3166                         op->o_req_ndn = be->be_nsuffix[0];
3167                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3168                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3169                         ldap_pvt_thread_join( tid, NULL );
3170                 }
3171         }
3172
3173         /* Didn't find a contextCSN, should we generate one? */
3174         if ( !si->si_ctxcsn ) {
3175                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3176                 struct berval csn;
3177
3178                 if ( slap_serverID || SLAP_SYNC_SHADOW( op->o_bd )) {
3179                 /* If we're also a consumer, then don't generate anything.
3180                  * Wait for our provider to send it to us, or for a local
3181                  * modify if we have multimaster.
3182                  */
3183                         goto out;
3184                 }
3185                 csn.bv_val = csnbuf;
3186                 csn.bv_len = sizeof( csnbuf );
3187                 slap_get_csn( op, &csn, 0 );
3188                 value_add_one( &si->si_ctxcsn, &csn );
3189                 si->si_numcsns = 1;
3190                 si->si_sids = ch_malloc( sizeof(int) );
3191                 si->si_sids[0] = slap_serverID;
3192
3193                 /* make sure we do a checkpoint on close */
3194                 si->si_numops++;
3195         }
3196
3197         /* Initialize the sessionlog mincsn */
3198         if ( si->si_logs && si->si_numcsns ) {
3199                 sessionlog *sl = si->si_logs;
3200                 int i;
3201                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3202                 sl->sl_numcsns = si->si_numcsns;
3203                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3204                 for ( i=0; i < si->si_numcsns; i++ )
3205                         sl->sl_sids[i] = si->si_sids[i];
3206         }
3207
3208 out:
3209         op->o_bd->bd_info = (BackendInfo *)on;
3210         return 0;
3211 }
3212
3213 /* Write the current contextCSN into the underlying db.
3214  */
3215 static int
3216 syncprov_db_close(
3217         BackendDB *be,
3218         ConfigReply *cr
3219 )
3220 {
3221     slap_overinst   *on = (slap_overinst *) be->bd_info;
3222     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3223 #ifdef SLAP_CONFIG_DELETE
3224         syncops *so, *sonext;
3225 #endif /* SLAP_CONFIG_DELETE */
3226
3227         if ( slapMode & SLAP_TOOL_MODE ) {
3228                 return 0;
3229         }
3230         if ( si->si_numops ) {
3231                 Connection conn = {0};
3232                 OperationBuffer opbuf;
3233                 Operation *op;
3234                 void *thrctx;
3235
3236                 thrctx = ldap_pvt_thread_pool_context();
3237                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3238                 op = &opbuf.ob_op;
3239                 op->o_bd = be;
3240                 op->o_dn = be->be_rootdn;
3241                 op->o_ndn = be->be_rootndn;
3242                 syncprov_checkpoint( op, on );
3243         }
3244
3245 #ifdef SLAP_CONFIG_DELETE
3246         if ( !slapd_shutdown ) {
3247                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
3248                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3249                         SlapReply rs = {REP_RESULT};
3250                         rs.sr_err = LDAP_UNAVAILABLE;
3251                         send_ldap_result( so->s_op, &rs );
3252                         sonext=so->s_next;
3253                         syncprov_drop_psearch( so, 0);
3254                 }
3255                 si->si_ops=NULL;
3256                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
3257         }
3258         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3259 #endif /* SLAP_CONFIG_DELETE */
3260
3261     return 0;
3262 }
3263
3264 static int
3265 syncprov_db_init(
3266         BackendDB *be,
3267         ConfigReply *cr
3268 )
3269 {
3270         slap_overinst   *on = (slap_overinst *)be->bd_info;
3271         syncprov_info_t *si;
3272
3273         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3274                 Debug( LDAP_DEBUG_ANY,
3275                         "syncprov must be instantiated within a database.\n",
3276                         0, 0, 0 );
3277                 return 1;
3278         }
3279
3280         si = ch_calloc(1, sizeof(syncprov_info_t));
3281         on->on_bi.bi_private = si;
3282         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3283         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3284         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3285         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3286
3287         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3288         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3289         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3290         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3291
3292         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3293         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3294
3295         return 0;
3296 }
3297
3298 static int
3299 syncprov_db_destroy(
3300         BackendDB *be,
3301         ConfigReply *cr
3302 )
3303 {
3304         slap_overinst   *on = (slap_overinst *)be->bd_info;
3305         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3306
3307         if ( si ) {
3308                 if ( si->si_logs ) {
3309                         sessionlog *sl = si->si_logs;
3310                         slog_entry *se = sl->sl_head;
3311
3312                         while ( se ) {
3313                                 slog_entry *se_next = se->se_next;
3314                                 ch_free( se );
3315                                 se = se_next;
3316                         }
3317                         if ( sl->sl_mincsn )
3318                                 ber_bvarray_free( sl->sl_mincsn );
3319                         if ( sl->sl_sids )
3320                                 ch_free( sl->sl_sids );
3321
3322                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3323                         ch_free( si->si_logs );
3324                 }
3325                 if ( si->si_ctxcsn )
3326                         ber_bvarray_free( si->si_ctxcsn );
3327                 if ( si->si_sids )
3328                         ch_free( si->si_sids );
3329                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3330                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3331                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3332                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3333                 ch_free( si );
3334         }
3335
3336         return 0;
3337 }
3338
3339 static int syncprov_parseCtrl (
3340         Operation *op,
3341         SlapReply *rs,
3342         LDAPControl *ctrl )
3343 {
3344         ber_tag_t tag;
3345         BerElementBuffer berbuf;
3346         BerElement *ber = (BerElement *)&berbuf;
3347         ber_int_t mode;
3348         ber_len_t len;
3349         struct berval cookie = BER_BVNULL;
3350         sync_control *sr;
3351         int rhint = 0;
3352
3353         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3354                 rs->sr_text = "Sync control specified multiple times";
3355                 return LDAP_PROTOCOL_ERROR;
3356         }
3357
3358         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3359                 rs->sr_text = "Sync control specified with pagedResults control";
3360                 return LDAP_PROTOCOL_ERROR;
3361         }
3362
3363         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3364                 rs->sr_text = "Sync control value is absent";
3365                 return LDAP_PROTOCOL_ERROR;
3366         }
3367
3368         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3369                 rs->sr_text = "Sync control value is empty";
3370                 return LDAP_PROTOCOL_ERROR;
3371         }
3372
3373         /* Parse the control value
3374          *      syncRequestValue ::= SEQUENCE {
3375          *              mode   ENUMERATED {
3376          *                      -- 0 unused
3377          *                      refreshOnly             (1),
3378          *                      -- 2 reserved
3379          *                      refreshAndPersist       (3)
3380          *              },
3381          *              cookie  syncCookie OPTIONAL
3382          *      }
3383          */
3384
3385         ber_init2( ber, &ctrl->ldctl_value, 0 );
3386
3387         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3388                 rs->sr_text = "Sync control : mode decoding error";
3389                 return LDAP_PROTOCOL_ERROR;
3390         }
3391
3392         switch( mode ) {
3393         case LDAP_SYNC_REFRESH_ONLY:
3394                 mode = SLAP_SYNC_REFRESH;
3395                 break;
3396         case LDAP_SYNC_REFRESH_AND_PERSIST:
3397                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3398                 break;
3399         default:
3400                 rs->sr_text = "Sync control : unknown update mode";
3401                 return LDAP_PROTOCOL_ERROR;
3402         }
3403
3404         tag = ber_peek_tag( ber, &len );
3405
3406         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3407                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3408                         rs->sr_text = "Sync control : cookie decoding error";
3409                         return LDAP_PROTOCOL_ERROR;
3410                 }
3411                 tag = ber_peek_tag( ber, &len );
3412         }
3413         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3414                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3415                         rs->sr_text = "Sync control : rhint decoding error";
3416                         return LDAP_PROTOCOL_ERROR;
3417                 }
3418         }
3419         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3420                         rs->sr_text = "Sync control : decoding error";
3421                         return LDAP_PROTOCOL_ERROR;
3422         }
3423         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3424         sr->sr_rhint = rhint;
3425         if (!BER_BVISNULL(&cookie)) {
3426                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3427                 /* If parse fails, pretend no cookie was sent */
3428                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3429                         sr->sr_state.rid == -1 ) {
3430                         if ( sr->sr_state.ctxcsn ) {
3431                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3432                                 sr->sr_state.ctxcsn = NULL;
3433                         }
3434                         sr->sr_state.numcsns = 0;
3435                 }
3436         }
3437
3438         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3439
3440         op->o_sync = ctrl->ldctl_iscritical
3441                 ? SLAP_CONTROL_CRITICAL
3442                 : SLAP_CONTROL_NONCRITICAL;
3443
3444         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3445
3446         return LDAP_SUCCESS;
3447 }
3448
3449 /* This overlay is set up for dynamic loading via moduleload. For static
3450  * configuration, you'll need to arrange for the slap_overinst to be
3451  * initialized and registered by some other function inside slapd.
3452  */
3453
3454 static slap_overinst            syncprov;
3455
3456 int
3457 syncprov_initialize()
3458 {
3459         int rc;
3460
3461         rc = register_supported_control( LDAP_CONTROL_SYNC,
3462                 SLAP_CTRL_SEARCH, NULL,
3463                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3464         if ( rc != LDAP_SUCCESS ) {
3465                 Debug( LDAP_DEBUG_ANY,
3466                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3467                 return rc;
3468         }
3469
3470         syncprov.on_bi.bi_type = "syncprov";
3471         syncprov.on_bi.bi_db_init = syncprov_db_init;
3472         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3473         syncprov.on_bi.bi_db_open = syncprov_db_open;
3474         syncprov.on_bi.bi_db_close = syncprov_db_close;
3475
3476         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3477         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3478
3479         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3480         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3481         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3482         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3483         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3484         syncprov.on_bi.bi_op_search = syncprov_op_search;
3485         syncprov.on_bi.bi_extended = syncprov_op_extended;
3486         syncprov.on_bi.bi_operational = syncprov_operational;
3487
3488         syncprov.on_bi.bi_cf_ocs = spocs;
3489
3490         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3491
3492         rc = config_register_schema( spcfg, spocs );
3493         if ( rc ) return rc;
3494
3495         return overlay_register( &syncprov );
3496 }
3497
3498 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3499 int
3500 init_module( int argc, char *argv[] )
3501 {
3502         return syncprov_initialize();
3503 }
3504 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3505
3506 #endif /* defined(SLAPD_OVER_SYNCPROV) */