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 2004-2014 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 /* A queued result of a persistent search */
  49 typedef struct syncres {
  50         struct syncres *s_next;
  51         Entry *s_e;
  52         struct berval s_dn;
  53         struct berval s_ndn;
  54         struct berval s_uuid;
  55         struct berval s_csn;
  56         char s_mode;
  57         char s_isreference;
  58 } syncres;
  59
  60 /* Record of a persistent search */
  61 typedef struct syncops {
  62         struct syncops *s_next;
  63         struct berval   s_base;         /* ndn of search base */
  64         ID              s_eid;          /* entryID of search base */
  65         Operation       *s_op;          /* search op */
  66         int             s_rid;
  67         int             s_sid;
  68         struct berval s_filterstr;
  69         int             s_flags;        /* search status */
  70 #define PS_IS_REFRESHING        0x01
  71 #define PS_IS_DETACHED          0x02
  72 #define PS_WROTE_BASE           0x04
  73 #define PS_FIND_BASE            0x08
  74 #define PS_FIX_FILTER           0x10
  75 #define PS_TASK_QUEUED          0x20
  76
  77         int             s_inuse;        /* reference count */
  78         struct syncres *s_res;
  79         struct syncres *s_restail;
  80         ldap_pvt_thread_mutex_t s_mutex;
  81 } syncops;
  82
  83 /* A received sync control */
  84 typedef struct sync_control {
  85         struct sync_cookie sr_state;
  86         int sr_rhint;
  87 } sync_control;
  88
  89 #if 0 /* moved back to slap.h */
  90 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  91 #endif
  92 /* o_sync_mode uses data bits of o_sync */
  93 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  94
  95 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  97 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  98 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  99
 100 /* Record of which searches matched at premodify step */
 101 typedef struct syncmatches {
 102         struct syncmatches *sm_next;
 103         syncops *sm_op;
 104 } syncmatches;
 105
 106 /* Session log data */
 107 typedef struct slog_entry {
 108         struct slog_entry *se_next;
 109         struct berval se_uuid;
 110         struct berval se_csn;
 111         int     se_sid;
 112         ber_tag_t       se_tag;
 113 } slog_entry;
 114
 115 typedef struct sessionlog {
 116         BerVarray       sl_mincsn;
 117         int             *sl_sids;
 118         int             sl_numcsns;
 119         int             sl_num;
 120         int             sl_size;
 121         slog_entry *sl_head;
 122         slog_entry *sl_tail;
 123         ldap_pvt_thread_mutex_t sl_mutex;
 124 } sessionlog;
 125
 126 /* The main state for this overlay */
 127 typedef struct syncprov_info_t {
 128         syncops         *si_ops;
 129         struct berval   si_contextdn;
 130         BerVarray       si_ctxcsn;      /* ldapsync context */
 131         int             *si_sids;
 132         int             si_numcsns;
 133         int             si_chkops;      /* checkpointing info */
 134         int             si_chktime;
 135         int             si_numops;      /* number of ops since last checkpoint */
 136         int             si_nopres;      /* Skip present phase */
 137         int             si_usehint;     /* use reload hint */
 138         int             si_active;      /* True if there are active mods */
 139         int             si_dirty;       /* True if the context is dirty, i.e changes
 140                                                  * have been made without updating the csn. */
 141         time_t  si_chklast;     /* time of last checkpoint */
 142         Avlnode *si_mods;       /* entries being modified */
 143         sessionlog      *si_logs;
 144         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 145         ldap_pvt_thread_mutex_t si_ops_mutex;
 146         ldap_pvt_thread_mutex_t si_mods_mutex;
 147         ldap_pvt_thread_mutex_t si_resp_mutex;
 148 } syncprov_info_t;
 149
 150 typedef struct opcookie {
 151         slap_overinst *son;
 152         syncmatches *smatches;
 153         modtarget *smt;
 154         Entry *se;
 155         struct berval sdn;      /* DN of entry, for deletes */
 156         struct berval sndn;
 157         struct berval suuid;    /* UUID of entry */
 158         struct berval sctxcsn;
 159         short osid;     /* sid of op csn */
 160         short rsid;     /* sid of relay */
 161         short sreference;       /* Is the entry a reference? */
 162 } opcookie;
 163
 164 typedef struct mutexint {
 165         ldap_pvt_thread_mutex_t mi_mutex;
 166         int mi_int;
 167 } mutexint;
 168
 169 typedef struct fbase_cookie {
 170         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 171         syncops *fss;   /* persistent search we're testing against */
 172         int fbase;      /* if TRUE we found the search base and it's still valid */
 173         int fscope;     /* if TRUE then fdn is within the psearch scope */
 174 } fbase_cookie;
 175
 176 static AttributeName csn_anlist[3];
 177 static AttributeName uuid_anlist[2];
 178
 179 /* Build a LDAPsync intermediate state control */
 180 static int
 181 syncprov_state_ctrl(
 182         Operation       *op,
 183         SlapReply       *rs,
 184         Entry           *e,
 185         int             entry_sync_state,
 186         LDAPControl     **ctrls,
 187         int             num_ctrls,
 188         int             send_cookie,
 189         struct berval   *cookie )
 190 {
 191         Attribute* a;
 192         int ret;
 193
 194         BerElementBuffer berbuf;
 195         BerElement *ber = (BerElement *)&berbuf;
 196         LDAPControl *cp;
 197         struct berval bv;
 198         struct berval   entryuuid_bv = BER_BVNULL;
 199
 200         ber_init2( ber, 0, LBER_USE_DER );
 201         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 202
 203         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 204                 AttributeDescription *desc = a->a_desc;
 205                 if ( desc == slap_schema.si_ad_entryUUID ) {
 206                         entryuuid_bv = a->a_nvals[0];
 207                         break;
 208                 }
 209         }
 210
 211         /* FIXME: what if entryuuid is NULL or empty ? */
 212
 213         if ( send_cookie && cookie ) {
 214                 ber_printf( ber, "{eOON}",
 215                         entry_sync_state, &entryuuid_bv, cookie );
 216         } else {
 217                 ber_printf( ber, "{eON}",
 218                         entry_sync_state, &entryuuid_bv );
 219         }
 220
 221         ret = ber_flatten2( ber, &bv, 0 );
 222         if ( ret == 0 ) {
 223                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 224                 cp->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 225                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 226                 cp->ldctl_value.bv_val = (char *)&cp[1];
 227                 cp->ldctl_value.bv_len = bv.bv_len;
 228                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 229                 ctrls[num_ctrls] = cp;
 230         }
 231         ber_free_buf( ber );
 232
 233         if ( ret < 0 ) {
 234                 Debug( LDAP_DEBUG_TRACE,
 235                         "slap_build_sync_ctrl: ber_flatten2 failed (%d)\n",
 236                         ret, 0, 0 );
 237                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 238                 return LDAP_OTHER;
 239         }
 240
 241         return LDAP_SUCCESS;
 242 }
 243
 244 /* Build a LDAPsync final state control */
 245 static int
 246 syncprov_done_ctrl(
 247         Operation       *op,
 248         SlapReply       *rs,
 249         LDAPControl     **ctrls,
 250         int                     num_ctrls,
 251         int                     send_cookie,
 252         struct berval *cookie,
 253         int                     refreshDeletes )
 254 {
 255         int ret;
 256         BerElementBuffer berbuf;
 257         BerElement *ber = (BerElement *)&berbuf;
 258         LDAPControl *cp;
 259         struct berval bv;
 260
 261         ber_init2( ber, NULL, LBER_USE_DER );
 262         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 263
 264         ber_printf( ber, "{" );
 265         if ( send_cookie && cookie ) {
 266                 ber_printf( ber, "O", cookie );
 267         }
 268         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 269                 ber_printf( ber, "b", refreshDeletes );
 270         }
 271         ber_printf( ber, "N}" );
 272
 273         ret = ber_flatten2( ber, &bv, 0 );
 274         if ( ret == 0 ) {
 275                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 276                 cp->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 277                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 278                 cp->ldctl_value.bv_val = (char *)&cp[1];
 279                 cp->ldctl_value.bv_len = bv.bv_len;
 280                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 281                 ctrls[num_ctrls] = cp;
 282         }
 283
 284         ber_free_buf( ber );
 285
 286         if ( ret < 0 ) {
 287                 Debug( LDAP_DEBUG_TRACE,
 288                         "syncprov_done_ctrl: ber_flatten2 failed (%d)\n",
 289                         ret, 0, 0 );
 290                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 291                 return LDAP_OTHER;
 292         }
 293
 294         return LDAP_SUCCESS;
 295 }
 296
 297 static int
 298 syncprov_sendinfo(
 299         Operation       *op,
 300         SlapReply       *rs,
 301         int                     type,
 302         struct berval *cookie,
 303         int                     refreshDone,
 304         BerVarray       syncUUIDs,
 305         int                     refreshDeletes )
 306 {
 307         BerElementBuffer berbuf;
 308         BerElement *ber = (BerElement *)&berbuf;
 309         struct berval rspdata;
 310
 311         int ret;
 312
 313         ber_init2( ber, NULL, LBER_USE_DER );
 314         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 315
 316         if ( type ) {
 317                 switch ( type ) {
 318                 case LDAP_TAG_SYNC_NEW_COOKIE:
 319                         ber_printf( ber, "tO", type, cookie );
 320                         break;
 321                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 322                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 323                         ber_printf( ber, "t{", type );
 324                         if ( cookie ) {
 325                                 ber_printf( ber, "O", cookie );
 326                         }
 327                         if ( refreshDone == 0 ) {
 328                                 ber_printf( ber, "b", refreshDone );
 329                         }
 330                         ber_printf( ber, "N}" );
 331                         break;
 332                 case LDAP_TAG_SYNC_ID_SET:
 333                         ber_printf( ber, "t{", type );
 334                         if ( cookie ) {
 335                                 ber_printf( ber, "O", cookie );
 336                         }
 337                         if ( refreshDeletes == 1 ) {
 338                                 ber_printf( ber, "b", refreshDeletes );
 339                         }
 340                         ber_printf( ber, "[W]", syncUUIDs );
 341                         ber_printf( ber, "N}" );
 342                         break;
 343                 default:
 344                         Debug( LDAP_DEBUG_TRACE,
 345                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 346                                 type, 0, 0 );
 347                         return LDAP_OTHER;
 348                 }
 349         }
 350
 351         ret = ber_flatten2( ber, &rspdata, 0 );
 352
 353         if ( ret < 0 ) {
 354                 Debug( LDAP_DEBUG_TRACE,
 355                         "syncprov_sendinfo: ber_flatten2 failed (%d)\n",
 356                         ret, 0, 0 );
 357                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 358                 return LDAP_OTHER;
 359         }
 360
 361         rs->sr_rspoid = LDAP_SYNC_INFO;
 362         rs->sr_rspdata = &rspdata;
 363         send_ldap_intermediate( op, rs );
 364         rs->sr_rspdata = NULL;
 365         ber_free_buf( ber );
 366
 367         return LDAP_SUCCESS;
 368 }
 369
 370 /* Find a modtarget in an AVL tree */
 371 static int
 372 sp_avl_cmp( const void *c1, const void *c2 )
 373 {
 374         const modtarget *m1, *m2;
 375         int rc;
 376
 377         m1 = c1; m2 = c2;
 378         rc = m1->mt_dn.bv_len - m2->mt_dn.bv_len;
 379
 380         if ( rc ) return rc;
 381         return ber_bvcmp( &m1->mt_dn, &m2->mt_dn );
 382 }
 383
 384 /* syncprov_findbase:
 385  *   finds the true DN of the base of a search (with alias dereferencing) and
 386  * checks to make sure the base entry doesn't get replaced with a different
 387  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 388  * change is detected, any persistent search on this base must be terminated /
 389  * reloaded.
 390  *   On the first call, we just save the DN and entryID. On subsequent calls
 391  * we compare the DN and entryID with the saved values.
 392  */
 393 static int
 394 findbase_cb( Operation *op, SlapReply *rs )
 395 {
 396         slap_callback *sc = op->o_callback;
 397
 398         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 399                 fbase_cookie *fc = sc->sc_private;
 400
 401                 /* If no entryID, we're looking for the first time.
 402                  * Just store whatever we got.
 403                  */
 404                 if ( fc->fss->s_eid == NOID ) {
 405                         fc->fbase = 2;
 406                         fc->fss->s_eid = rs->sr_entry->e_id;
 407                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 408
 409                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 410                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 411
 412                 /* OK, the DN is the same and the entryID is the same. */
 413                         fc->fbase = 1;
 414                 }
 415         }
 416         if ( rs->sr_err != LDAP_SUCCESS ) {
 417                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 418         }
 419         return LDAP_SUCCESS;
 420 }
 421
 422 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 423 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 424
 425 static int
 426 syncprov_findbase( Operation *op, fbase_cookie *fc )
 427 {
 428         /* Use basic parameters from syncrepl search, but use
 429          * current op's threadctx / tmpmemctx
 430          */
 431         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 432         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 433                 slap_callback cb = {0};
 434                 Operation fop;
 435                 SlapReply frs = { REP_RESULT };
 436                 int rc;
 437
 438                 fc->fss->s_flags ^= PS_FIND_BASE;
 439                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 440
 441                 fop = *fc->fss->s_op;
 442
 443                 fop.o_bd = fop.o_bd->bd_self;
 444                 fop.o_hdr = op->o_hdr;
 445                 fop.o_time = op->o_time;
 446                 fop.o_tincr = op->o_tincr;
 447                 fop.o_extra = op->o_extra;
 448
 449                 cb.sc_response = findbase_cb;
 450                 cb.sc_private = fc;
 451
 452                 fop.o_sync_mode = 0;    /* turn off sync mode */
 453                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 454                 fop.o_callback = &cb;
 455                 fop.o_tag = LDAP_REQ_SEARCH;
 456                 fop.ors_scope = LDAP_SCOPE_BASE;
 457                 fop.ors_limit = NULL;
 458                 fop.ors_slimit = 1;
 459                 fop.ors_tlimit = SLAP_NO_LIMIT;
 460                 fop.ors_attrs = slap_anlist_no_attrs;
 461                 fop.ors_attrsonly = 1;
 462                 fop.ors_filter = &generic_filter;
 463                 fop.ors_filterstr = generic_filterstr;
 464
 465                 rc = fop.o_bd->be_search( &fop, &frs );
 466         } else {
 467                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 468                 fc->fbase = 1;
 469         }
 470
 471         /* After the first call, see if the fdn resides in the scope */
 472         if ( fc->fbase == 1 ) {
 473                 switch ( fc->fss->s_op->ors_scope ) {
 474                 case LDAP_SCOPE_BASE:
 475                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 476                         break;
 477                 case LDAP_SCOPE_ONELEVEL: {
 478                         struct berval pdn;
 479                         dnParent( fc->fdn, &pdn );
 480                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 481                         break; }
 482                 case LDAP_SCOPE_SUBTREE:
 483                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 484                         break;
 485                 case LDAP_SCOPE_SUBORDINATE:
 486                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 487                                 !dn_match( fc->fdn, &fc->fss->s_base );
 488                         break;
 489                 }
 490         }
 491
 492         if ( fc->fbase )
 493                 return LDAP_SUCCESS;
 494
 495         /* If entryID has changed, then the base of this search has
 496          * changed. Invalidate the psearch.
 497          */
 498         return LDAP_NO_SUCH_OBJECT;
 499 }
 500
 501 /* syncprov_findcsn:
 502  *   This function has three different purposes, but they all use a search
 503  * that filters on entryCSN so they're combined here.
 504  * 1: at startup time, after a contextCSN has been read from the database,
 505  * we search for all entries with CSN >= contextCSN in case the contextCSN
 506  * was not checkpointed at the previous shutdown.
 507  *
 508  * 2: when the current contextCSN is known and we have a sync cookie, we search
 509  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 510  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 511  *
 512  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 513  * CSN, and generate Present records for them. We always collect this result
 514  * in SyncID sets, even if there's only one match.
 515  */
 516 typedef enum find_csn_t {
 517         FIND_MAXCSN     = 1,
 518         FIND_CSN        = 2,
 519         FIND_PRESENT    = 3
 520 } find_csn_t;
 521
 522 static int
 523 findmax_cb( Operation *op, SlapReply *rs )
 524 {
 525         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 526                 struct berval *maxcsn = op->o_callback->sc_private;
 527                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 528                         slap_schema.si_ad_entryCSN );
 529
 530                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 531                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 532                         maxcsn->bv_len = a->a_vals[0].bv_len;
 533                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 534                 }
 535         }
 536         return LDAP_SUCCESS;
 537 }
 538
 539 static int
 540 findcsn_cb( Operation *op, SlapReply *rs )
 541 {
 542         slap_callback *sc = op->o_callback;
 543
 544         /* We just want to know that at least one exists, so it's OK if
 545          * we exceed the unchecked limit.
 546          */
 547         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 548                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 549                 sc->sc_private = (void *)1;
 550         }
 551         return LDAP_SUCCESS;
 552 }
 553
 554 /* Build a list of entryUUIDs for sending in a SyncID set */
 555
 556 #define UUID_LEN        16
 557
 558 typedef struct fpres_cookie {
 559         int num;
 560         BerVarray uuids;
 561         char *last;
 562 } fpres_cookie;
 563
 564 static int
 565 findpres_cb( Operation *op, SlapReply *rs )
 566 {
 567         slap_callback *sc = op->o_callback;
 568         fpres_cookie *pc = sc->sc_private;
 569         Attribute *a;
 570         int ret = SLAP_CB_CONTINUE;
 571
 572         switch ( rs->sr_type ) {
 573         case REP_SEARCH:
 574                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 575                 if ( a ) {
 576                         pc->uuids[pc->num].bv_val = pc->last;
 577                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 578                                 pc->uuids[pc->num].bv_len );
 579                         pc->num++;
 580                         pc->last = pc->uuids[pc->num].bv_val;
 581                         pc->uuids[pc->num].bv_val = NULL;
 582                 }
 583                 ret = LDAP_SUCCESS;
 584                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 585                         break;
 586                 /* FALLTHRU */
 587         case REP_RESULT:
 588                 ret = rs->sr_err;
 589                 if ( pc->num ) {
 590                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 591                                 0, pc->uuids, 0 );
 592                         pc->uuids[pc->num].bv_val = pc->last;
 593                         pc->num = 0;
 594                         pc->last = pc->uuids[0].bv_val;
 595                 }
 596                 break;
 597         default:
 598                 break;
 599         }
 600         return ret;
 601 }
 602
 603 static int
 604 syncprov_findcsn( Operation *op, find_csn_t mode, struct berval *csn )
 605 {
 606         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 607         syncprov_info_t         *si = on->on_bi.bi_private;
 608
 609         slap_callback cb = {0};
 610         Operation fop;
 611         SlapReply frs = { REP_RESULT };
 612         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 613         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 614         struct berval maxcsn;
 615         Filter cf;
 616         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 617         fpres_cookie pcookie;
 618         sync_control *srs = NULL;
 619         struct slap_limits_set fc_limits;
 620         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 621         int maxid;
 622
 623         if ( mode != FIND_MAXCSN ) {
 624                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 625         }
 626
 627         fop = *op;
 628         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 629         /* We want pure entries, not referrals */
 630         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 631
 632         cf.f_ava = &eq;
 633         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 634         BER_BVZERO( &cf.f_av_value );
 635         cf.f_next = NULL;
 636
 637         fop.o_callback = &cb;
 638         fop.ors_limit = NULL;
 639         fop.ors_tlimit = SLAP_NO_LIMIT;
 640         fop.ors_filter = &cf;
 641         fop.ors_filterstr.bv_val = buf;
 642
 643 again:
 644         switch( mode ) {
 645         case FIND_MAXCSN:
 646                 cf.f_choice = LDAP_FILTER_GE;
 647                 /* If there are multiple CSNs, use the one with our serverID */
 648                 for ( i=0; i<si->si_numcsns; i++) {
 649                         if ( slap_serverID == si->si_sids[i] ) {
 650                                 maxid = i;
 651                                 break;
 652                         }
 653                 }
 654                 if ( i == si->si_numcsns ) {
 655                         /* No match: this is multimaster, and none of the content in the DB
 656                          * originated locally. Treat like no CSN.
 657                          */
 658                         return LDAP_NO_SUCH_OBJECT;
 659                 }
 660                 cf.f_av_value = si->si_ctxcsn[maxid];
 661                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 662                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 663                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 664                         return LDAP_OTHER;
 665                 }
 666                 fop.ors_attrsonly = 0;
 667                 fop.ors_attrs = csn_anlist;
 668                 fop.ors_slimit = SLAP_NO_LIMIT;
 669                 cb.sc_private = &maxcsn;
 670                 cb.sc_response = findmax_cb;
 671                 strcpy( cbuf, cf.f_av_value.bv_val );
 672                 maxcsn.bv_val = cbuf;
 673                 maxcsn.bv_len = cf.f_av_value.bv_len;
 674                 break;
 675         case FIND_CSN:
 676                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 677                         cf.f_av_value = *csn;
 678                 }
 679                 fop.o_dn = op->o_bd->be_rootdn;
 680                 fop.o_ndn = op->o_bd->be_rootndn;
 681                 fop.o_req_dn = op->o_bd->be_suffix[0];
 682                 fop.o_req_ndn = op->o_bd->be_nsuffix[0];
 683                 /* Look for exact match the first time */
 684                 if ( findcsn_retry ) {
 685                         cf.f_choice = LDAP_FILTER_EQUALITY;
 686                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 687                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 688                 /* On retry, look for <= */
 689                 } else {
 690                         cf.f_choice = LDAP_FILTER_LE;
 691                         fop.ors_limit = &fc_limits;
 692                         memset( &fc_limits, 0, sizeof( fc_limits ));
 693                         fc_limits.lms_s_unchecked = 1;
 694                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 695                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 696                 }
 697                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 698                         return LDAP_OTHER;
 699                 }
 700                 fop.ors_attrsonly = 1;
 701                 fop.ors_attrs = slap_anlist_no_attrs;
 702                 fop.ors_slimit = 1;
 703                 cb.sc_private = NULL;
 704                 cb.sc_response = findcsn_cb;
 705                 break;
 706         case FIND_PRESENT:
 707                 fop.ors_filter = op->ors_filter;
 708                 fop.ors_filterstr = op->ors_filterstr;
 709                 fop.ors_attrsonly = 0;
 710                 fop.ors_attrs = uuid_anlist;
 711                 fop.ors_slimit = SLAP_NO_LIMIT;
 712                 cb.sc_private = &pcookie;
 713                 cb.sc_response = findpres_cb;
 714                 pcookie.num = 0;
 715
 716                 /* preallocate storage for a full set */
 717                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 718                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 719                         op->o_tmpmemctx );
 720                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 721                 pcookie.uuids[0].bv_val = pcookie.last;
 722                 pcookie.uuids[0].bv_len = UUID_LEN;
 723                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 724                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 725                         pcookie.uuids[i].bv_len = UUID_LEN;
 726                 }
 727                 break;
 728         }
 729
 730         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 731         fop.o_bd->be_search( &fop, &frs );
 732         fop.o_bd->bd_info = (BackendInfo *)on;
 733
 734         switch( mode ) {
 735         case FIND_MAXCSN:
 736                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 737 #ifdef CHECK_CSN
 738                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 739                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 740 #endif
 741                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 742                         si->si_numops++;        /* ensure a checkpoint */
 743                 }
 744                 break;
 745         case FIND_CSN:
 746                 /* If matching CSN was not found, invalidate the context. */
 747                 if ( !cb.sc_private ) {
 748                         /* If we didn't find an exact match, then try for <= */
 749                         if ( findcsn_retry ) {
 750                                 findcsn_retry = 0;
 751                                 rs_reinit( &frs, REP_RESULT );
 752                                 goto again;
 753                         }
 754                         rc = LDAP_NO_SUCH_OBJECT;
 755                 }
 756                 break;
 757         case FIND_PRESENT:
 758                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 759                 break;
 760         }
 761
 762         return rc;
 763 }
 764
 765 /* Should find a place to cache these */
 766 static mutexint *get_mutexint()
 767 {
 768         mutexint *mi = ch_malloc( sizeof( mutexint ));
 769         ldap_pvt_thread_mutex_init( &mi->mi_mutex );
 770         mi->mi_int = 1;
 771         return mi;
 772 }
 773
 774 static void inc_mutexint( mutexint *mi )
 775 {
 776         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 777         mi->mi_int++;
 778         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 779 }
 780
 781 /* return resulting counter */
 782 static int dec_mutexint( mutexint *mi )
 783 {
 784         int i;
 785         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 786         i = --mi->mi_int;
 787         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 788         if ( !i ) {
 789                 ldap_pvt_thread_mutex_destroy( &mi->mi_mutex );
 790                 ch_free( mi );
 791         }
 792         return i;
 793 }
 794
 795 static int
 796 syncprov_free_syncop( syncops *so )
 797 {
 798         syncres *sr, *srnext;
 799         GroupAssertion *ga, *gnext;
 800
 801         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 802         /* already being freed, or still in use */
 803         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 804                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 805                 return 0;
 806         }
 807         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 808         if ( so->s_flags & PS_IS_DETACHED ) {
 809                 filter_free( so->s_op->ors_filter );
 810                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 811                         gnext = ga->ga_next;
 812                         ch_free( ga );
 813                 }
 814                 ch_free( so->s_op );
 815         }
 816         ch_free( so->s_base.bv_val );
 817         for ( sr=so->s_res; sr; sr=srnext ) {
 818                 srnext = sr->s_next;
 819                 if ( sr->s_e ) {
 820                         if ( !dec_mutexint( sr->s_e->e_private )) {
 821                                 sr->s_e->e_private = NULL;
 822                                 entry_free( sr->s_e );
 823                         }
 824                 }
 825                 ch_free( sr );
 826         }
 827         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 828         ch_free( so );
 829         return 1;
 830 }
 831
 832 /* Send a persistent search response */
 833 static int
 834 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, int mode )
 835 {
 836         SlapReply rs = { REP_SEARCH };
 837         struct berval cookie, csns[2];
 838         Entry e_uuid = {0};
 839         Attribute a_uuid = {0};
 840
 841         if ( so->s_op->o_abandon )
 842                 return SLAPD_ABANDON;
 843
 844         rs.sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2, op->o_tmpmemctx );
 845         rs.sr_ctrls[1] = NULL;
 846         rs.sr_flags = REP_CTRLS_MUSTBEFREED;
 847         csns[0] = opc->sctxcsn;
 848         BER_BVZERO( &csns[1] );
 849         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 850
 851 #ifdef LDAP_DEBUG
 852         if ( so->s_sid > 0 ) {
 853                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 854                         so->s_sid, cookie.bv_val, 0 );
 855         } else {
 856                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 857                         cookie.bv_val, 0, 0 );
 858         }
 859 #endif
 860
 861         e_uuid.e_attrs = &a_uuid;
 862         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 863         a_uuid.a_nvals = &opc->suuid;
 864         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 865                 mode, rs.sr_ctrls, 0, 1, &cookie );
 866         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 867
 868         rs.sr_entry = &e_uuid;
 869         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 870                 e_uuid = *opc->se;
 871                 e_uuid.e_private = NULL;
 872         }
 873
 874         switch( mode ) {
 875         case LDAP_SYNC_ADD:
 876                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 877                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 878                         rs.sr_err = send_search_reference( op, &rs );
 879                         ber_bvarray_free( rs.sr_ref );
 880                         break;
 881                 }
 882                 /* fallthru */
 883         case LDAP_SYNC_MODIFY:
 884                 rs.sr_attrs = op->ors_attrs;
 885                 rs.sr_err = send_search_entry( op, &rs );
 886                 break;
 887         case LDAP_SYNC_DELETE:
 888                 e_uuid.e_attrs = NULL;
 889                 e_uuid.e_name = opc->sdn;
 890                 e_uuid.e_nname = opc->sndn;
 891                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 892                         struct berval bv = BER_BVNULL;
 893                         rs.sr_ref = &bv;
 894                         rs.sr_err = send_search_reference( op, &rs );
 895                 } else {
 896                         rs.sr_err = send_search_entry( op, &rs );
 897                 }
 898                 break;
 899         default:
 900                 assert(0);
 901         }
 902         return rs.sr_err;
 903 }
 904
 905 static void
 906 syncprov_qstart( syncops *so );
 907
 908 /* Play back queued responses */
 909 static int
 910 syncprov_qplay( Operation *op, syncops *so )
 911 {
 912         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 913         syncres *sr;
 914         opcookie opc;
 915         int rc = 0;
 916
 917         opc.son = on;
 918
 919         do {
 920                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 921                 sr = so->s_res;
 922                 /* Exit loop with mutex held */
 923                 if ( !sr )
 924                         break;
 925                 so->s_res = sr->s_next;
 926                 if ( !so->s_res )
 927                         so->s_restail = NULL;
 928                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 929
 930                 if ( !so->s_op->o_abandon ) {
 931
 932                         if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 933                                 SlapReply rs = { REP_INTERMEDIATE };
 934
 935                                 rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 936                                         &sr->s_csn, 0, NULL, 0 );
 937                         } else {
 938                                 opc.sdn = sr->s_dn;
 939                                 opc.sndn = sr->s_ndn;
 940                                 opc.suuid = sr->s_uuid;
 941                                 opc.sctxcsn = sr->s_csn;
 942                                 opc.sreference = sr->s_isreference;
 943                                 opc.se = sr->s_e;
 944
 945                                 rc = syncprov_sendresp( op, &opc, so, sr->s_mode );
 946                         }
 947                 }
 948
 949                 if ( sr->s_e ) {
 950                         if ( !dec_mutexint( sr->s_e->e_private )) {
 951                                 sr->s_e->e_private = NULL;
 952                                 entry_free ( sr->s_e );
 953                         }
 954                 }
 955                 ch_free( sr );
 956
 957                 if ( so->s_op->o_abandon )
 958                         continue;
 959
 960                 /* Exit loop with mutex held */
 961                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 962                 break;
 963
 964         } while (1);
 965
 966         /* We now only send one change at a time, to prevent one
 967          * psearch from hogging all the CPU. Resubmit this task if
 968          * there are more responses queued and no errors occurred.
 969          */
 970
 971         if ( rc == 0 && so->s_res ) {
 972                 syncprov_qstart( so );
 973         } else {
 974                 so->s_flags ^= PS_TASK_QUEUED;
 975         }
 976
 977         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 978         return rc;
 979 }
 980
 981 /* task for playing back queued responses */
 982 static void *
 983 syncprov_qtask( void *ctx, void *arg )
 984 {
 985         syncops *so = arg;
 986         OperationBuffer opbuf;
 987         Operation *op;
 988         BackendDB be;
 989         int rc;
 990
 991         op = &opbuf.ob_op;
 992         *op = *so->s_op;
 993         op->o_hdr = &opbuf.ob_hdr;
 994         op->o_controls = opbuf.ob_controls;
 995         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 996         op->o_sync = SLAP_CONTROL_IGNORED;
 997
 998         *op->o_hdr = *so->s_op->o_hdr;
 999
1000         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
1001         op->o_tmpmfuncs = &slap_sl_mfuncs;
1002         op->o_threadctx = ctx;
1003
1004         /* syncprov_qplay expects a fake db */
1005         be = *so->s_op->o_bd;
1006         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1007         op->o_bd = &be;
1008         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1009         op->o_callback = NULL;
1010
1011         rc = syncprov_qplay( op, so );
1012
1013         /* decrement use count... */
1014         syncprov_free_syncop( so );
1015
1016         return NULL;
1017 }
1018
1019 /* Start the task to play back queued psearch responses */
1020 static void
1021 syncprov_qstart( syncops *so )
1022 {
1023         so->s_flags |= PS_TASK_QUEUED;
1024         so->s_inuse++;
1025         ldap_pvt_thread_pool_submit( &connection_pool,
1026                 syncprov_qtask, so );
1027 }
1028
1029 /* Queue a persistent search response */
1030 static int
1031 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1032 {
1033         syncres *sr;
1034         int srsize;
1035         struct berval cookie = opc->sctxcsn;
1036
1037         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1038                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1039
1040                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1041                         so->s_rid, slap_serverID ? slap_serverID : -1);
1042         }
1043
1044         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1045                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1046         if ( cookie.bv_len )
1047                 srsize += cookie.bv_len + 1;
1048         sr = ch_malloc( srsize );
1049         sr->s_next = NULL;
1050         sr->s_e = opc->se;
1051         /* bump refcount on this entry */
1052         if ( opc->se )
1053                 inc_mutexint( opc->se->e_private );
1054         sr->s_dn.bv_val = (char *)(sr + 1);
1055         sr->s_dn.bv_len = opc->sdn.bv_len;
1056         sr->s_mode = mode;
1057         sr->s_isreference = opc->sreference;
1058         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1059                  opc->sdn.bv_val ) + 1;
1060         sr->s_ndn.bv_len = opc->sndn.bv_len;
1061         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1062                  opc->sndn.bv_val ) + 1;
1063         sr->s_uuid.bv_len = opc->suuid.bv_len;
1064         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1065         if ( cookie.bv_len ) {
1066                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1067                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1068         } else {
1069                 sr->s_csn.bv_val = NULL;
1070         }
1071         sr->s_csn.bv_len = cookie.bv_len;
1072
1073         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1074                 ch_free( cookie.bv_val );
1075         }
1076
1077         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1078         if ( !so->s_res ) {
1079                 so->s_res = sr;
1080         } else {
1081                 so->s_restail->s_next = sr;
1082         }
1083         so->s_restail = sr;
1084
1085         /* If the base of the psearch was modified, check it next time round */
1086         if ( so->s_flags & PS_WROTE_BASE ) {
1087                 so->s_flags ^= PS_WROTE_BASE;
1088                 so->s_flags |= PS_FIND_BASE;
1089         }
1090         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1091                 syncprov_qstart( so );
1092         }
1093         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1094         return LDAP_SUCCESS;
1095 }
1096
1097 static int
1098 syncprov_drop_psearch( syncops *so, int lock )
1099 {
1100         if ( so->s_flags & PS_IS_DETACHED ) {
1101                 if ( lock )
1102                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1103                 so->s_op->o_conn->c_n_ops_executing--;
1104                 so->s_op->o_conn->c_n_ops_completed++;
1105                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1106                         o_next );
1107                 if ( lock )
1108                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1109         }
1110         return syncprov_free_syncop( so );
1111 }
1112
1113 static int
1114 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1115 {
1116         slap_callback *sc = op->o_callback;
1117         op->o_callback = sc->sc_next;
1118         syncprov_drop_psearch( sc->sc_private, 0 );
1119         op->o_tmpfree( sc, op->o_tmpmemctx );
1120         return 0;
1121 }
1122
1123 static int
1124 syncprov_op_abandon( Operation *op, SlapReply *rs )
1125 {
1126         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1127         syncprov_info_t         *si = on->on_bi.bi_private;
1128         syncops *so, *soprev;
1129
1130         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1131         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1132                 soprev=so, so=so->s_next ) {
1133                 if ( so->s_op->o_connid == op->o_connid &&
1134                         so->s_op->o_msgid == op->orn_msgid ) {
1135                                 so->s_op->o_abandon = 1;
1136                                 soprev->s_next = so->s_next;
1137                                 break;
1138                 }
1139         }
1140         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1141         if ( so ) {
1142                 /* Is this really a Cancel exop? */
1143                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1144                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1145                         rs->sr_err = LDAP_CANCELLED;
1146                         send_ldap_result( so->s_op, rs );
1147                         if ( so->s_flags & PS_IS_DETACHED ) {
1148                                 slap_callback *cb;
1149                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1150                                 cb->sc_cleanup = syncprov_ab_cleanup;
1151                                 cb->sc_next = op->o_callback;
1152                                 cb->sc_private = so;
1153                                 op->o_callback = cb;
1154                                 return SLAP_CB_CONTINUE;
1155                         }
1156                 }
1157                 syncprov_drop_psearch( so, 0 );
1158         }
1159         return SLAP_CB_CONTINUE;
1160 }
1161
1162 /* Find which persistent searches are affected by this operation */
1163 static void
1164 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1165 {
1166         slap_overinst *on = opc->son;
1167         syncprov_info_t         *si = on->on_bi.bi_private;
1168
1169         fbase_cookie fc;
1170         syncops **pss;
1171         Entry *e = NULL;
1172         Attribute *a;
1173         int rc, gonext;
1174         struct berval newdn;
1175         int freefdn = 0;
1176         BackendDB *b0 = op->o_bd, db;
1177
1178         fc.fdn = &op->o_req_ndn;
1179         /* compute new DN */
1180         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1181                 struct berval pdn;
1182                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1183                 else dnParent( fc.fdn, &pdn );
1184                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1185                 fc.fdn = &newdn;
1186                 freefdn = 1;
1187         }
1188         if ( op->o_tag != LDAP_REQ_ADD ) {
1189                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1190                         db = *op->o_bd;
1191                         op->o_bd = &db;
1192                 }
1193                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1194                 /* If we're sending responses now, make a copy and unlock the DB */
1195                 if ( e && !saveit ) {
1196                         if ( !opc->se ) {
1197                                 opc->se = entry_dup( e );
1198                                 opc->se->e_private = get_mutexint();
1199                         }
1200                         overlay_entry_release_ov( op, e, 0, on );
1201                         e = opc->se;
1202                 }
1203                 if ( rc ) {
1204                         op->o_bd = b0;
1205                         return;
1206                 }
1207         } else {
1208                 e = op->ora_e;
1209                 if ( !saveit ) {
1210                         if ( !opc->se ) {
1211                                 opc->se = entry_dup( e );
1212                                 opc->se->e_private = get_mutexint();
1213                         }
1214                         e = opc->se;
1215                 }
1216         }
1217
1218         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1219                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1220                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1221                 opc->sreference = is_entry_referral( e );
1222                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1223                 if ( a )
1224                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1225         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1226                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1227                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1228                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1229                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1230         }
1231
1232         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1233         for (pss = &si->si_ops; *pss; pss = gonext ? &(*pss)->s_next : pss)
1234         {
1235                 Operation op2;
1236                 Opheader oh;
1237                 syncmatches *sm;
1238                 int found = 0;
1239                 syncops *snext, *ss = *pss;
1240
1241                 gonext = 1;
1242                 if ( ss->s_op->o_abandon )
1243                         continue;
1244
1245                 /* Don't send ops back to the originator */
1246                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1247                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1248                                 opc->osid, 0, 0 );
1249                         continue;
1250                 }
1251
1252                 /* Don't send ops back to the messenger */
1253                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1254                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1255                                 opc->rsid, 0, 0 );
1256                         continue;
1257                 }
1258
1259                 /* validate base */
1260                 fc.fss = ss;
1261                 fc.fbase = 0;
1262                 fc.fscope = 0;
1263
1264                 /* If the base of the search is missing, signal a refresh */
1265                 rc = syncprov_findbase( op, &fc );
1266                 if ( rc != LDAP_SUCCESS ) {
1267                         SlapReply rs = {REP_RESULT};
1268                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1269                                 "search base has changed" );
1270                         snext = ss->s_next;
1271                         if ( syncprov_drop_psearch( ss, 1 ) )
1272                                 *pss = snext;
1273                         gonext = 0;
1274                         continue;
1275                 }
1276
1277                 /* If we're sending results now, look for this op in old matches */
1278                 if ( !saveit ) {
1279                         syncmatches *old;
1280
1281                         /* Did we modify the search base? */
1282                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1283                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1284                                 ss->s_flags |= PS_WROTE_BASE;
1285                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1286                         }
1287
1288                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1289                                 old=sm, sm=sm->sm_next ) {
1290                                 if ( sm->sm_op == ss ) {
1291                                         found = 1;
1292                                         old->sm_next = sm->sm_next;
1293                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1294                                         break;
1295                                 }
1296                         }
1297                 }
1298
1299                 if ( fc.fscope ) {
1300                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1301                         op2 = *ss->s_op;
1302                         oh = *op->o_hdr;
1303                         oh.oh_conn = ss->s_op->o_conn;
1304                         oh.oh_connid = ss->s_op->o_connid;
1305                         op2.o_bd = op->o_bd->bd_self;
1306                         op2.o_hdr = &oh;
1307                         op2.o_extra = op->o_extra;
1308                         op2.o_callback = NULL;
1309                         if (ss->s_flags & PS_FIX_FILTER) {
1310                                 /* Skip the AND/GE clause that we stuck on in front. We
1311                                    would lose deletes/mods that happen during the refresh
1312                                    phase otherwise (ITS#6555) */
1313                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1314                         }
1315                         rc = test_filter( &op2, e, op2.ors_filter );
1316                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1317                 }
1318
1319                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1320                         ss->s_sid, fc.fscope, rc );
1321
1322                 /* check if current o_req_dn is in scope and matches filter */
1323                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1324                         if ( saveit ) {
1325                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1326                                 sm->sm_next = opc->smatches;
1327                                 sm->sm_op = ss;
1328                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1329                                 ++ss->s_inuse;
1330                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1331                                 opc->smatches = sm;
1332                         } else {
1333                                 /* if found send UPDATE else send ADD */
1334                                 syncprov_qresp( opc, ss,
1335                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1336                         }
1337                 } else if ( !saveit && found ) {
1338                         /* send DELETE */
1339                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1340                 } else if ( !saveit ) {
1341                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1342                 }
1343                 if ( !saveit && found ) {
1344                         /* Decrement s_inuse, was incremented when called
1345                          * with saveit == TRUE
1346                          */
1347                         snext = ss->s_next;
1348                         if ( syncprov_free_syncop( ss ) ) {
1349                                 *pss = snext;
1350                                 gonext = 0;
1351                         }
1352                 }
1353         }
1354         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1355
1356         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1357                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1358                         op->o_bd = &db;
1359                 }
1360                 if ( saveit )
1361                         overlay_entry_release_ov( op, e, 0, on );
1362                 op->o_bd = b0;
1363         }
1364         if ( opc->se && !saveit ) {
1365                 if ( !dec_mutexint( opc->se->e_private )) {
1366                         opc->se->e_private = NULL;
1367                         entry_free( opc->se );
1368                         opc->se = NULL;
1369                 }
1370         }
1371         if ( freefdn ) {
1372                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1373         }
1374         op->o_bd = b0;
1375 }
1376
1377 static int
1378 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1379 {
1380         slap_callback *cb = op->o_callback;
1381         opcookie *opc = cb->sc_private;
1382         slap_overinst *on = opc->son;
1383         syncprov_info_t         *si = on->on_bi.bi_private;
1384         syncmatches *sm, *snext;
1385         modtarget *mt;
1386
1387         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1388         if ( si->si_active )
1389                 si->si_active--;
1390         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1391
1392         for (sm = opc->smatches; sm; sm=snext) {
1393                 snext = sm->sm_next;
1394                 syncprov_free_syncop( sm->sm_op );
1395                 op->o_tmpfree( sm, op->o_tmpmemctx );
1396         }
1397
1398         /* Remove op from lock table */
1399         mt = opc->smt;
1400         if ( mt ) {
1401                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1402                 mt->mt_mods = mt->mt_mods->mi_next;
1403                 /* If there are more, promote the next one */
1404                 if ( mt->mt_mods ) {
1405                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1406                 } else {
1407                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1408                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1409                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1410                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1411                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1412                         ch_free( mt->mt_dn.bv_val );
1413                         ch_free( mt );
1414                 }
1415         }
1416         if ( !BER_BVISNULL( &opc->suuid ))
1417                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1418         if ( !BER_BVISNULL( &opc->sndn ))
1419                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1420         if ( !BER_BVISNULL( &opc->sdn ))
1421                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1422         op->o_callback = cb->sc_next;
1423         op->o_tmpfree(cb, op->o_tmpmemctx);
1424
1425         return 0;
1426 }
1427
1428 static void
1429 syncprov_checkpoint( Operation *op, slap_overinst *on )
1430 {
1431         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1432         Modifications mod;
1433         Operation opm;
1434         SlapReply rsm = {REP_RESULT};
1435         slap_callback cb = {0};
1436         BackendDB be;
1437         BackendInfo *bi;
1438
1439 #ifdef CHECK_CSN
1440         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1441
1442         int i;
1443         for ( i=0; i<si->si_numcsns; i++ ) {
1444                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1445         }
1446 #endif
1447         mod.sml_numvals = si->si_numcsns;
1448         mod.sml_values = si->si_ctxcsn;
1449         mod.sml_nvalues = NULL;
1450         mod.sml_desc = slap_schema.si_ad_contextCSN;
1451         mod.sml_op = LDAP_MOD_REPLACE;
1452         mod.sml_flags = SLAP_MOD_INTERNAL;
1453         mod.sml_next = NULL;
1454
1455         cb.sc_response = slap_null_cb;
1456         opm = *op;
1457         opm.o_tag = LDAP_REQ_MODIFY;
1458         opm.o_callback = &cb;
1459         opm.orm_modlist = &mod;
1460         opm.orm_no_opattrs = 1;
1461         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1462                 be = *on->on_info->oi_origdb;
1463                 opm.o_bd = &be;
1464         }
1465         opm.o_req_dn = si->si_contextdn;
1466         opm.o_req_ndn = si->si_contextdn;
1467         bi = opm.o_bd->bd_info;
1468         opm.o_bd->bd_info = on->on_info->oi_orig;
1469         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1470         opm.o_no_schema_check = 1;
1471         opm.o_bd->be_modify( &opm, &rsm );
1472
1473         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1474                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1475                 const char      *text;
1476                 char txtbuf[SLAP_TEXT_BUFLEN];
1477                 size_t textlen = sizeof txtbuf;
1478                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1479                 rs_reinit( &rsm, REP_RESULT );
1480                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1481                 opm.ora_e = e;
1482                 opm.o_bd->be_add( &opm, &rsm );
1483                 if ( e == opm.ora_e )
1484                         be_entry_release_w( &opm, opm.ora_e );
1485         }
1486         opm.o_bd->bd_info = bi;
1487
1488         if ( mod.sml_next != NULL ) {
1489                 slap_mods_free( mod.sml_next, 1 );
1490         }
1491 #ifdef CHECK_CSN
1492         for ( i=0; i<si->si_numcsns; i++ ) {
1493                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1494         }
1495 #endif
1496 }
1497
1498 static void
1499 syncprov_add_slog( Operation *op )
1500 {
1501         opcookie *opc = op->o_callback->sc_private;
1502         slap_overinst *on = opc->son;
1503         syncprov_info_t         *si = on->on_bi.bi_private;
1504         sessionlog *sl;
1505         slog_entry *se;
1506
1507         sl = si->si_logs;
1508         {
1509                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1510                         /* During the syncrepl refresh phase we can receive operations
1511                          * without a csn.  We cannot reliably determine the consumers
1512                          * state with respect to such operations, so we ignore them and
1513                          * wipe out anything in the log if we see them.
1514                          */
1515                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1516                         while ( se = sl->sl_head ) {
1517                                 sl->sl_head = se->se_next;
1518                                 ch_free( se );
1519                         }
1520                         sl->sl_tail = NULL;
1521                         sl->sl_num = 0;
1522                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1523                         return;
1524                 }
1525
1526                 /* Allocate a record. UUIDs are not NUL-terminated. */
1527                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1528                         op->o_csn.bv_len + 1 );
1529                 se->se_next = NULL;
1530                 se->se_tag = op->o_tag;
1531
1532                 se->se_uuid.bv_val = (char *)(&se[1]);
1533                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1534                 se->se_uuid.bv_len = opc->suuid.bv_len;
1535
1536                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1537                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1538                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1539                 se->se_csn.bv_len = op->o_csn.bv_len;
1540                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1541
1542                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1543                 if ( sl->sl_head ) {
1544                         /* Keep the list in csn order. */
1545                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1546                                 sl->sl_tail->se_next = se;
1547                                 sl->sl_tail = se;
1548                         } else {
1549                                 slog_entry **sep;
1550
1551                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1552                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1553                                                 se->se_next = *sep;
1554                                                 *sep = se;
1555                                                 break;
1556                                         }
1557                                 }
1558                         }
1559                 } else {
1560                         sl->sl_head = se;
1561                         sl->sl_tail = se;
1562                         if ( !sl->sl_mincsn ) {
1563                                 sl->sl_numcsns = 1;
1564                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1565                                 sl->sl_sids = ch_malloc( sizeof( int ));
1566                                 sl->sl_sids[0] = se->se_sid;
1567                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1568                                 BER_BVZERO( &sl->sl_mincsn[1] );
1569                         }
1570                 }
1571                 sl->sl_num++;
1572                 while ( sl->sl_num > sl->sl_size ) {
1573                         int i, j;
1574                         se = sl->sl_head;
1575                         sl->sl_head = se->se_next;
1576                         for ( i=0; i<sl->sl_numcsns; i++ )
1577                                 if ( sl->sl_sids[i] >= se->se_sid )
1578                                         break;
1579                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1580                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1581                                         i, se->se_sid, &se->se_csn );
1582                         } else {
1583                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1584                         }
1585                         ch_free( se );
1586                         sl->sl_num--;
1587                 }
1588                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1589         }
1590 }
1591
1592 /* Just set a flag if we found the matching entry */
1593 static int
1594 playlog_cb( Operation *op, SlapReply *rs )
1595 {
1596         if ( rs->sr_type == REP_SEARCH ) {
1597                 op->o_callback->sc_private = (void *)1;
1598         }
1599         return rs->sr_err;
1600 }
1601
1602 /* enter with sl->sl_mutex locked, release before returning */
1603 static void
1604 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1605         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1606 {
1607         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1608         slog_entry *se;
1609         int i, j, ndel, num, nmods, mmods;
1610         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1611         BerVarray uuids;
1612         struct berval delcsn[2];
1613
1614         if ( !sl->sl_num ) {
1615                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1616                 return;
1617         }
1618
1619         num = sl->sl_num;
1620         i = 0;
1621         nmods = 0;
1622
1623         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1624                 num * UUID_LEN, op->o_tmpmemctx );
1625         uuids[0].bv_val = (char *)(uuids + num + 1);
1626
1627         delcsn[0].bv_len = 0;
1628         delcsn[0].bv_val = cbuf;
1629         BER_BVZERO(&delcsn[1]);
1630
1631         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1632          * and everything else at the end. Do this first so we can
1633          * unlock the list mutex.
1634          */
1635         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1636                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1637         for ( se=sl->sl_head; se; se=se->se_next ) {
1638                 int k;
1639                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1640                 ndel = 1;
1641                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1642                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1643                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1644                                 break;
1645                         }
1646                 }
1647                 if ( ndel <= 0 ) {
1648                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1649                         continue;
1650                 }
1651                 ndel = 0;
1652                 for ( k=0; k<numcsns; k++ ) {
1653                         if ( se->se_sid == sids[k] ) {
1654                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1655                                 break;
1656                         }
1657                 }
1658                 if ( ndel > 0 ) {
1659                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1660                         break;
1661                 }
1662                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1663                         j = i;
1664                         i++;
1665                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1666                         delcsn[0].bv_len = se->se_csn.bv_len;
1667                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1668                 } else {
1669                         if ( se->se_tag == LDAP_REQ_ADD )
1670                                 continue;
1671                         nmods++;
1672                         j = num - nmods;
1673                 }
1674                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1675                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1676                 uuids[j].bv_len = UUID_LEN;
1677         }
1678         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1679
1680         ndel = i;
1681
1682         /* Zero out unused slots */
1683         for ( i=ndel; i < num - nmods; i++ )
1684                 uuids[i].bv_len = 0;
1685
1686         /* Mods must be validated to see if they belong in this delete set.
1687          */
1688
1689         mmods = nmods;
1690         /* Strip any duplicates */
1691         for ( i=0; i<nmods; i++ ) {
1692                 for ( j=0; j<ndel; j++ ) {
1693                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1694                                 uuids[num - 1 - i].bv_len = 0;
1695                                 mmods --;
1696                                 break;
1697                         }
1698                 }
1699                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1700                 for ( j=0; j<i; j++ ) {
1701                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1702                                 uuids[num - 1 - i].bv_len = 0;
1703                                 mmods --;
1704                                 break;
1705                         }
1706                 }
1707         }
1708
1709         if ( mmods ) {
1710                 Operation fop;
1711                 int rc;
1712                 Filter mf, af;
1713                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1714                 slap_callback cb = {0};
1715
1716                 fop = *op;
1717
1718                 fop.o_sync_mode = 0;
1719                 fop.o_callback = &cb;
1720                 fop.ors_limit = NULL;
1721                 fop.ors_tlimit = SLAP_NO_LIMIT;
1722                 fop.ors_attrs = slap_anlist_all_attributes;
1723                 fop.ors_attrsonly = 0;
1724                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1725
1726                 af.f_choice = LDAP_FILTER_AND;
1727                 af.f_next = NULL;
1728                 af.f_and = &mf;
1729                 mf.f_choice = LDAP_FILTER_EQUALITY;
1730                 mf.f_ava = &eq;
1731                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1732                 mf.f_next = fop.ors_filter;
1733
1734                 fop.ors_filter = &af;
1735
1736                 cb.sc_response = playlog_cb;
1737                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1738
1739                 for ( i=ndel; i<num; i++ ) {
1740                   if ( uuids[i].bv_len != 0 ) {
1741                         SlapReply frs = { REP_RESULT };
1742
1743                         mf.f_av_value = uuids[i];
1744                         cb.sc_private = NULL;
1745                         fop.ors_slimit = 1;
1746                         rc = fop.o_bd->be_search( &fop, &frs );
1747
1748                         /* If entry was not found, add to delete list */
1749                         if ( !cb.sc_private ) {
1750                                 uuids[ndel++] = uuids[i];
1751                         }
1752                   }
1753                 }
1754                 fop.o_bd->bd_info = (BackendInfo *)on;
1755         }
1756         if ( ndel ) {
1757                 struct berval cookie;
1758
1759                 if ( delcsn[0].bv_len ) {
1760                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1761                                 slap_serverID ? slap_serverID : -1 );
1762
1763                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1764                 }
1765
1766                 uuids[ndel].bv_val = NULL;
1767                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1768                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1769                 if ( delcsn[0].bv_len ) {
1770                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1771                 }
1772         }
1773         op->o_tmpfree( uuids, op->o_tmpmemctx );
1774 }
1775
1776 static int
1777 syncprov_op_response( Operation *op, SlapReply *rs )
1778 {
1779         opcookie *opc = op->o_callback->sc_private;
1780         slap_overinst *on = opc->son;
1781         syncprov_info_t         *si = on->on_bi.bi_private;
1782         syncmatches *sm;
1783
1784         if ( rs->sr_err == LDAP_SUCCESS )
1785         {
1786                 struct berval maxcsn;
1787                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1788                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1789
1790                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1791
1792                 /* Update our context CSN */
1793                 cbuf[0] = '\0';
1794                 maxcsn.bv_val = cbuf;
1795                 maxcsn.bv_len = sizeof(cbuf);
1796                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1797
1798                 slap_get_commit_csn( op, &maxcsn, &foundit );
1799                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1800                         /* syncrepl queues the CSN values in the db where
1801                          * it is configured , not where the changes are made.
1802                          * So look for a value in the glue db if we didn't
1803                          * find any in this db.
1804                          */
1805                         BackendDB *be = op->o_bd;
1806                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1807                         maxcsn.bv_val = cbuf;
1808                         maxcsn.bv_len = sizeof(cbuf);
1809                         slap_get_commit_csn( op, &maxcsn, &foundit );
1810                         op->o_bd = be;
1811                 }
1812                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1813                         int i, sid;
1814 #ifdef CHECK_CSN
1815                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1816                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1817 #endif
1818                         sid = slap_parse_csn_sid( &maxcsn );
1819                         for ( i=0; i<si->si_numcsns; i++ ) {
1820                                 if ( sid < si->si_sids[i] )
1821                                         break;
1822                                 if ( sid == si->si_sids[i] ) {
1823                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1824                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1825                                                 csn_changed = 1;
1826                                         }
1827                                         break;
1828                                 }
1829                         }
1830                         /* It's a new SID for us */
1831                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1832                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1833                                         i, sid, &maxcsn );
1834                                 csn_changed = 1;
1835                         }
1836                 }
1837
1838                 /* Don't do any processing for consumer contextCSN updates */
1839                 if ( op->o_dont_replicate ) {
1840                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1841                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1842                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1843                         /* Catch contextCSN updates from syncrepl. We have to look at
1844                          * all the attribute values, as there may be more than one csn
1845                          * that changed, and only one can be passed in the csn queue.
1846                          */
1847                         Modifications *mod = op->orm_modlist;
1848                         unsigned i;
1849                         int j, sid;
1850
1851                         for ( i=0; i<mod->sml_numvals; i++ ) {
1852                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1853                                 for ( j=0; j<si->si_numcsns; j++ ) {
1854                                         if ( sid < si->si_sids[j] )
1855                                                 break;
1856                                         if ( sid == si->si_sids[j] ) {
1857                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1858                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1859                                                         csn_changed = 1;
1860                                                 }
1861                                                 break;
1862                                         }
1863                                 }
1864
1865                                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1866                                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1867                                                 j, sid, &mod->sml_values[i] );
1868                                         csn_changed = 1;
1869                                 }
1870                         }
1871                         if ( csn_changed )
1872                                 si->si_dirty = 0;
1873                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1874
1875                         if ( csn_changed ) {
1876                                 syncops *ss;
1877                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1878                                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1879                                         if ( ss->s_op->o_abandon )
1880                                                 continue;
1881                                         /* Send the updated csn to all syncrepl consumers,
1882                                          * including the server from which it originated.
1883                                          * The syncrepl consumer and syncprov provider on
1884                                          * the originating server may be configured to store
1885                                          * their csn values in different entries.
1886                                          */
1887                                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1888                                 }
1889                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1890                         }
1891                         } else {
1892                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1893                         }
1894                         goto leave;
1895                 }
1896
1897                 si->si_numops++;
1898                 if ( si->si_chkops || si->si_chktime ) {
1899                         /* Never checkpoint adding the context entry,
1900                          * it will deadlock
1901                          */
1902                         if ( op->o_tag != LDAP_REQ_ADD ||
1903                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1904                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1905                                         do_check = 1;
1906                                         si->si_numops = 0;
1907                                 }
1908                                 if ( si->si_chktime &&
1909                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1910                                         if ( si->si_chklast ) {
1911                                                 do_check = 1;
1912                                                 si->si_chklast = op->o_time;
1913                                         } else {
1914                                                 si->si_chklast = 1;
1915                                         }
1916                                 }
1917                         }
1918                 }
1919                 si->si_dirty = !csn_changed;
1920                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1921
1922                 if ( do_check ) {
1923                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1924                         syncprov_checkpoint( op, on );
1925                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1926                 }
1927
1928                 /* only update consumer ctx if this is a newer csn */
1929                 if ( csn_changed ) {
1930                         opc->sctxcsn = maxcsn;
1931                 }
1932
1933                 /* Handle any persistent searches */
1934                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1935                 have_psearches = ( si->si_ops != NULL );
1936                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1937                 if ( have_psearches ) {
1938                         switch(op->o_tag) {
1939                         case LDAP_REQ_ADD:
1940                         case LDAP_REQ_MODIFY:
1941                         case LDAP_REQ_MODRDN:
1942                         case LDAP_REQ_EXTENDED:
1943                                 syncprov_matchops( op, opc, 0 );
1944                                 break;
1945                         case LDAP_REQ_DELETE:
1946                                 /* for each match in opc->smatches:
1947                                  *   send DELETE msg
1948                                  */
1949                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1950                                         if ( sm->sm_op->s_op->o_abandon )
1951                                                 continue;
1952                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1953                                 }
1954                                 break;
1955                         }
1956                 }
1957
1958                 /* Add any log records */
1959                 if ( si->si_logs ) {
1960                         syncprov_add_slog( op );
1961                 }
1962 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1963         }
1964         return SLAP_CB_CONTINUE;
1965 }
1966
1967 /* We don't use a subentry to store the context CSN any more.
1968  * We expose the current context CSN as an operational attribute
1969  * of the suffix entry.
1970  */
1971 static int
1972 syncprov_op_compare( Operation *op, SlapReply *rs )
1973 {
1974         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1975         syncprov_info_t         *si = on->on_bi.bi_private;
1976         int rc = SLAP_CB_CONTINUE;
1977
1978         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1979                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1980         {
1981                 Entry e = {0};
1982                 Attribute a = {0};
1983
1984                 e.e_name = si->si_contextdn;
1985                 e.e_nname = si->si_contextdn;
1986                 e.e_attrs = &a;
1987
1988                 a.a_desc = slap_schema.si_ad_contextCSN;
1989
1990                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1991
1992                 a.a_vals = si->si_ctxcsn;
1993                 a.a_nvals = a.a_vals;
1994                 a.a_numvals = si->si_numcsns;
1995
1996                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1997                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1998                 if ( ! rs->sr_err ) {
1999                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
2000                         goto return_results;
2001                 }
2002
2003                 if ( get_assert( op ) &&
2004                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
2005                 {
2006                         rs->sr_err = LDAP_ASSERTION_FAILED;
2007                         goto return_results;
2008                 }
2009
2010
2011                 rs->sr_err = LDAP_COMPARE_FALSE;
2012
2013                 if ( attr_valfind( &a,
2014                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2015                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2016                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2017                 {
2018                         rs->sr_err = LDAP_COMPARE_TRUE;
2019                 }
2020
2021 return_results:;
2022
2023                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2024
2025                 send_ldap_result( op, rs );
2026
2027                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2028                         rs->sr_err = LDAP_SUCCESS;
2029                 }
2030                 rc = rs->sr_err;
2031         }
2032
2033         return rc;
2034 }
2035
2036 static int
2037 syncprov_op_mod( Operation *op, SlapReply *rs )
2038 {
2039         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2040         syncprov_info_t         *si = on->on_bi.bi_private;
2041         slap_callback *cb;
2042         opcookie *opc;
2043         int have_psearches, cbsize;
2044
2045         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2046         have_psearches = ( si->si_ops != NULL );
2047         si->si_active++;
2048         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2049
2050         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2051                 (have_psearches ? sizeof(modinst) : 0 );
2052
2053         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2054         opc = (opcookie *)(cb+1);
2055         opc->son = on;
2056         cb->sc_response = syncprov_op_response;
2057         cb->sc_cleanup = syncprov_op_cleanup;
2058         cb->sc_private = opc;
2059         cb->sc_next = op->o_callback;
2060         op->o_callback = cb;
2061
2062         opc->osid = -1;
2063         opc->rsid = -1;
2064         if ( op->o_csn.bv_val ) {
2065                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2066         }
2067         if ( op->o_controls ) {
2068                 struct sync_cookie *scook =
2069                 op->o_controls[slap_cids.sc_LDAPsync];
2070                 if ( scook )
2071                         opc->rsid = scook->sid;
2072         }
2073
2074         if ( op->o_dont_replicate )
2075                 return SLAP_CB_CONTINUE;
2076
2077         /* If there are active persistent searches, lock this operation.
2078          * See seqmod.c for the locking logic on its own.
2079          */
2080         if ( have_psearches ) {
2081                 modtarget *mt, mtdummy;
2082                 modinst *mi;
2083
2084                 mi = (modinst *)(opc+1);
2085                 mi->mi_op = op;
2086
2087                 /* See if we're already modifying this entry... */
2088                 mtdummy.mt_dn = op->o_req_ndn;
2089                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2090                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2091                 if ( mt ) {
2092                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2093                         if ( mt->mt_mods == NULL ) {
2094                                 /* Cannot reuse this mt, as another thread is about
2095                                  * to release it in syncprov_op_cleanup.
2096                                  */
2097                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2098                                 mt = NULL;
2099                         }
2100                 }
2101                 if ( mt ) {
2102                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2103                         mt->mt_tail->mi_next = mi;
2104                         mt->mt_tail = mi;
2105                         /* wait for this op to get to head of list */
2106                         while ( mt->mt_mods != mi ) {
2107                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2108                                 /* FIXME: if dynamic config can delete overlays or
2109                                  * databases we'll have to check for cleanup here.
2110                                  * Currently it's not an issue because there are
2111                                  * no dynamic config deletes...
2112                                  */
2113                                 if ( slapd_shutdown )
2114                                         return SLAPD_ABANDON;
2115
2116                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2117                                         ldap_pvt_thread_yield();
2118                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2119
2120                                 /* clean up if the caller is giving up */
2121                                 if ( op->o_abandon ) {
2122                                         modinst *m2;
2123                                         for ( m2 = mt->mt_mods; m2 && m2->mi_next != mi;
2124                                                 m2 = m2->mi_next );
2125                                         if ( m2 ) {
2126                                                 m2->mi_next = mi->mi_next;
2127                                                 if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2128                                         }
2129                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2130                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2131                                         return SLAPD_ABANDON;
2132                                 }
2133                         }
2134                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2135                 } else {
2136                         /* Record that we're modifying this entry now */
2137                         mt = ch_malloc( sizeof(modtarget) );
2138                         mt->mt_mods = mi;
2139                         mt->mt_tail = mi;
2140                         ber_dupbv( &mt->mt_dn, &mi->mi_op->o_req_ndn );
2141                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2142                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2143                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2144                 }
2145                 opc->smt = mt;
2146         }
2147
2148         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2149                 syncprov_matchops( op, opc, 1 );
2150
2151         return SLAP_CB_CONTINUE;
2152 }
2153
2154 static int
2155 syncprov_op_extended( Operation *op, SlapReply *rs )
2156 {
2157         if ( exop_is_write( op ))
2158                 return syncprov_op_mod( op, rs );
2159
2160         return SLAP_CB_CONTINUE;
2161 }
2162
2163 typedef struct searchstate {
2164         slap_overinst *ss_on;
2165         syncops *ss_so;
2166         BerVarray ss_ctxcsn;
2167         int *ss_sids;
2168         int ss_numcsns;
2169 #define SS_PRESENT      0x01
2170 #define SS_CHANGED      0x02
2171         int ss_flags;
2172 } searchstate;
2173
2174 typedef struct SyncOperationBuffer {
2175         Operation               sob_op;
2176         Opheader                sob_hdr;
2177         OpExtra                 sob_oe;
2178         AttributeName   sob_extra;      /* not always present */
2179         /* Further data allocated here */
2180 } SyncOperationBuffer;
2181
2182 static void
2183 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2184 {
2185         SyncOperationBuffer *sopbuf2;
2186         Operation *op2;
2187         int i, alen = 0;
2188         size_t size;
2189         char *ptr;
2190         GroupAssertion *g1, *g2;
2191
2192         /* count the search attrs */
2193         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2194                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2195         }
2196         /* Make a new copy of the operation */
2197         size = offsetof( SyncOperationBuffer, sob_extra ) +
2198                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2199                 op->o_req_dn.bv_len + 1 +
2200                 op->o_req_ndn.bv_len + 1 +
2201                 op->o_ndn.bv_len + 1 +
2202                 so->s_filterstr.bv_len + 1;
2203         sopbuf2 = ch_calloc( 1, size );
2204         op2 = &sopbuf2->sob_op;
2205         op2->o_hdr = &sopbuf2->sob_hdr;
2206         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2207
2208         /* Copy the fields we care about explicitly, leave the rest alone */
2209         *op2->o_hdr = *op->o_hdr;
2210         op2->o_tag = op->o_tag;
2211         op2->o_time = op->o_time;
2212         op2->o_bd = on->on_info->oi_origdb;
2213         op2->o_request = op->o_request;
2214         op2->o_managedsait = op->o_managedsait;
2215         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2216         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2217
2218         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2219         if ( i ) {
2220                 op2->ors_attrs = (AttributeName *) ptr;
2221                 ptr = (char *) &op2->ors_attrs[i+1];
2222                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2223                         op2->ors_attrs[i] = op->ors_attrs[i];
2224                         op2->ors_attrs[i].an_name.bv_val = ptr;
2225                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2226                 }
2227                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2228         }
2229
2230         op2->o_authz = op->o_authz;
2231         op2->o_ndn.bv_val = ptr;
2232         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2233         op2->o_dn = op2->o_ndn;
2234         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2235         op2->o_req_dn.bv_val = ptr;
2236         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2237         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2238         op2->o_req_ndn.bv_val = ptr;
2239         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2240         op2->ors_filterstr.bv_val = ptr;
2241         strcpy( ptr, so->s_filterstr.bv_val );
2242         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2243
2244         /* Skip the AND/GE clause that we stuck on in front */
2245         if ( so->s_flags & PS_FIX_FILTER ) {
2246                 op2->ors_filter = op->ors_filter->f_and->f_next;
2247                 so->s_flags ^= PS_FIX_FILTER;
2248         } else {
2249                 op2->ors_filter = op->ors_filter;
2250         }
2251         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2252         so->s_op = op2;
2253
2254         /* Copy any cached group ACLs individually */
2255         op2->o_groups = NULL;
2256         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2257                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2258                 *g2 = *g1;
2259                 strcpy( g2->ga_ndn, g1->ga_ndn );
2260                 g2->ga_next = op2->o_groups;
2261                 op2->o_groups = g2;
2262         }
2263         /* Don't allow any further group caching */
2264         op2->o_do_not_cache = 1;
2265
2266         /* Add op2 to conn so abandon will find us */
2267         op->o_conn->c_n_ops_executing++;
2268         op->o_conn->c_n_ops_completed--;
2269         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2270         so->s_flags |= PS_IS_DETACHED;
2271
2272         /* Prevent anyone else from trying to send a result for this op */
2273         op->o_abandon = 1;
2274 }
2275
2276 static int
2277 syncprov_search_response( Operation *op, SlapReply *rs )
2278 {
2279         searchstate *ss = op->o_callback->sc_private;
2280         slap_overinst *on = ss->ss_on;
2281         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2282         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2283
2284         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2285                 Attribute *a;
2286                 /* If we got a referral without a referral object, there's
2287                  * something missing that we cannot replicate. Just ignore it.
2288                  * The consumer will abort because we didn't send the expected
2289                  * control.
2290                  */
2291                 if ( !rs->sr_entry ) {
2292                         assert( rs->sr_entry != NULL );
2293                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2294                         return SLAP_CB_CONTINUE;
2295                 }
2296                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2297                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2298                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2299                 }
2300                 if ( a ) {
2301                         int i, sid;
2302                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2303
2304                         /* Don't send changed entries back to the originator */
2305                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2306                                 Debug( LDAP_DEBUG_SYNC,
2307                                         "Entry %s changed by peer, ignored\n",
2308                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2309                                 return LDAP_SUCCESS;
2310                         }
2311
2312                         /* If not a persistent search */
2313                         if ( !ss->ss_so ) {
2314                                 /* Make sure entry is less than the snapshot'd contextCSN */
2315                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2316                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2317                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2318                                                 Debug( LDAP_DEBUG_SYNC,
2319                                                         "Entry %s CSN %s greater than snapshot %s\n",
2320                                                         rs->sr_entry->e_name.bv_val,
2321                                                         a->a_nvals[0].bv_val,
2322                                                         ss->ss_ctxcsn[i].bv_val );
2323                                                 return LDAP_SUCCESS;
2324                                         }
2325                                 }
2326                         }
2327
2328                         /* Don't send old entries twice */
2329                         if ( srs->sr_state.ctxcsn ) {
2330                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2331                                         if ( sid == srs->sr_state.sids[i] &&
2332                                                 ber_bvcmp( &a->a_nvals[0],
2333                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2334                                                 Debug( LDAP_DEBUG_SYNC,
2335                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2336                                                         rs->sr_entry->e_name.bv_val,
2337                                                         a->a_nvals[0].bv_val,
2338                                                         srs->sr_state.ctxcsn[i].bv_val );
2339                                                 return LDAP_SUCCESS;
2340                                         }
2341                                 }
2342                         }
2343                 }
2344                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2345                         op->o_tmpmemctx );
2346                 rs->sr_ctrls[1] = NULL;
2347                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2348                 /* If we're in delta-sync mode, always send a cookie */
2349                 if ( si->si_nopres && si->si_usehint && a ) {
2350                         struct berval cookie;
2351                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2352                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2353                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2354                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2355                 } else {
2356                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2357                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2358                 }
2359         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2360                 struct berval cookie = BER_BVNULL;
2361
2362                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2363                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2364                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2365                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2366
2367                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2368                 }
2369
2370                 /* Is this a regular refresh?
2371                  * Note: refresh never gets here if there were no changes
2372                  */
2373                 if ( !ss->ss_so ) {
2374                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2375                                 op->o_tmpmemctx );
2376                         rs->sr_ctrls[1] = NULL;
2377                         rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2378                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2379                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2380                                         LDAP_SYNC_REFRESH_DELETES );
2381                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2382                 } else {
2383                 /* It's RefreshAndPersist, transition to Persist phase */
2384                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2385                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2386                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2387                                 1, NULL, 0 );
2388                         if ( !BER_BVISNULL( &cookie ))
2389                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2390
2391                         /* Detach this Op from frontend control */
2392                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2393
2394                         /* But not if this connection was closed along the way */
2395                         if ( op->o_abandon ) {
2396                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2397                                 /* syncprov_ab_cleanup will free this syncop */
2398                                 return SLAPD_ABANDON;
2399
2400                         } else {
2401                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2402                                 /* Turn off the refreshing flag */
2403                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2404
2405                                 syncprov_detach_op( op, ss->ss_so, on );
2406
2407                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2408
2409                                 /* If there are queued responses, fire them off */
2410                                 if ( ss->ss_so->s_res )
2411                                         syncprov_qstart( ss->ss_so );
2412                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2413                         }
2414
2415                         return LDAP_SUCCESS;
2416                 }
2417         }
2418
2419         return SLAP_CB_CONTINUE;
2420 }
2421
2422 static int
2423 syncprov_op_search( Operation *op, SlapReply *rs )
2424 {
2425         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2426         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2427         slap_callback   *cb;
2428         int gotstate = 0, changed = 0, do_present = 0;
2429         syncops *sop = NULL;
2430         searchstate *ss;
2431         sync_control *srs;
2432         BerVarray ctxcsn;
2433         int i, *sids, numcsns;
2434         struct berval mincsn, maxcsn;
2435         int minsid, maxsid;
2436         int dirty = 0;
2437
2438         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2439
2440         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2441                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2442                 return rs->sr_err;
2443         }
2444
2445         srs = op->o_controls[slap_cids.sc_LDAPsync];
2446
2447         /* If this is a persistent search, set it up right away */
2448         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2449                 syncops so = {0};
2450                 fbase_cookie fc;
2451                 opcookie opc;
2452                 slap_callback sc;
2453
2454                 fc.fss = &so;
2455                 fc.fbase = 0;
2456                 so.s_eid = NOID;
2457                 so.s_op = op;
2458                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2459                 /* syncprov_findbase expects to be called as a callback... */
2460                 sc.sc_private = &opc;
2461                 opc.son = on;
2462                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2463                 cb = op->o_callback;
2464                 op->o_callback = &sc;
2465                 rs->sr_err = syncprov_findbase( op, &fc );
2466                 op->o_callback = cb;
2467                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2468
2469                 if ( rs->sr_err != LDAP_SUCCESS ) {
2470                         send_ldap_result( op, rs );
2471                         return rs->sr_err;
2472                 }
2473                 sop = ch_malloc( sizeof( syncops ));
2474                 *sop = so;
2475                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2476                 sop->s_rid = srs->sr_state.rid;
2477                 sop->s_sid = srs->sr_state.sid;
2478                 /* set refcount=2 to prevent being freed out from under us
2479                  * by abandons that occur while we're running here
2480                  */
2481                 sop->s_inuse = 2;
2482
2483                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2484                 while ( si->si_active ) {
2485                         /* Wait for active mods to finish before proceeding, as they
2486                          * may already have inspected the si_ops list looking for
2487                          * consumers to replicate the change to.  Using the log
2488                          * doesn't help, as we may finish playing it before the
2489                          * active mods gets added to it.
2490                          */
2491                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2492                         if ( slapd_shutdown ) {
2493                                 ch_free( sop );
2494                                 return SLAPD_ABANDON;
2495                         }
2496                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2497                                 ldap_pvt_thread_yield();
2498                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2499                 }
2500                 sop->s_next = si->si_ops;
2501                 si->si_ops = sop;
2502                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2503         }
2504
2505         /* snapshot the ctxcsn */
2506         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2507         numcsns = si->si_numcsns;
2508         if ( numcsns ) {
2509                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2510                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2511                 for ( i=0; i<numcsns; i++ )
2512                         sids[i] = si->si_sids[i];
2513         } else {
2514                 ctxcsn = NULL;
2515                 sids = NULL;
2516         }
2517         dirty = si->si_dirty;
2518         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2519
2520         /* If we have a cookie, handle the PRESENT lookups */
2521         if ( srs->sr_state.ctxcsn ) {
2522                 sessionlog *sl;
2523                 int i, j;
2524
2525                 /* If we don't have any CSN of our own yet, pretend nothing
2526                  * has changed.
2527                  */
2528                 if ( !numcsns )
2529                         goto no_change;
2530
2531                 if ( !si->si_nopres )
2532                         do_present = SS_PRESENT;
2533
2534                 /* If there are SIDs we don't recognize in the cookie, drop them */
2535                 for (i=0; i<srs->sr_state.numcsns; ) {
2536                         for (j=i; j<numcsns; j++) {
2537                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2538                                         break;
2539                                 }
2540                         }
2541                         /* not found */
2542                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2543                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2544                                 srs->sr_state.numcsns--;
2545                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2546                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2547                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2548                                 }
2549                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2550                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2551                                 continue;
2552                         }
2553                         i++;
2554                 }
2555
2556                 if (srs->sr_state.numcsns != numcsns) {
2557                         /* consumer doesn't have the right number of CSNs */
2558                         changed = SS_CHANGED;
2559                         if ( srs->sr_state.ctxcsn ) {
2560                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2561                                 srs->sr_state.ctxcsn = NULL;
2562                         }
2563                         if ( srs->sr_state.sids ) {
2564                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2565                                 srs->sr_state.sids = NULL;
2566                         }
2567                         srs->sr_state.numcsns = 0;
2568                         goto shortcut;
2569                 }
2570
2571                 /* Find the smallest CSN which differs from contextCSN */
2572                 mincsn.bv_len = 0;
2573                 maxcsn.bv_len = 0;
2574                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2575                         int newer;
2576                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2577                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2578                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2579                                 maxcsn = srs->sr_state.ctxcsn[i];
2580                                 maxsid = sids[j];
2581                         }
2582                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2583                         /* If our state is newer, tell consumer about changes */
2584                         if ( newer < 0) {
2585                                 changed = SS_CHANGED;
2586                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2587                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2588                                         mincsn = srs->sr_state.ctxcsn[i];
2589                                         minsid = sids[j];
2590                                 }
2591                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2592                         /* our state is older, complain to consumer */
2593                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2594                                 rs->sr_text = "consumer state is newer than provider!";
2595 bailout:
2596                                 if ( sop ) {
2597                                         syncops **sp = &si->si_ops;
2598
2599                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2600                                         while ( *sp != sop )
2601                                                 sp = &(*sp)->s_next;
2602                                         *sp = sop->s_next;
2603                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2604                                         ch_free( sop );
2605                                 }
2606                                 rs->sr_ctrls = NULL;
2607                                 send_ldap_result( op, rs );
2608                                 return rs->sr_err;
2609                         }
2610                 }
2611                 if ( BER_BVISEMPTY( &mincsn )) {
2612                         mincsn = maxcsn;
2613                         minsid = maxsid;
2614                 }
2615
2616                 /* If nothing has changed, shortcut it */
2617                 if ( !changed && !dirty ) {
2618                         do_present = 0;
2619 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2620                                 LDAPControl     *ctrls[2];
2621
2622                                 ctrls[0] = NULL;
2623                                 ctrls[1] = NULL;
2624                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2625                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2626                                 rs->sr_ctrls = ctrls;
2627                                 rs->sr_err = LDAP_SUCCESS;
2628                                 send_ldap_result( op, rs );
2629                                 rs->sr_ctrls = NULL;
2630                                 return rs->sr_err;
2631                         }
2632                         goto shortcut;
2633                 }
2634
2635                 /* Do we have a sessionlog for this search? */
2636                 sl=si->si_logs;
2637                 if ( sl ) {
2638                         int do_play = 0;
2639                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2640                         /* Are there any log entries, and is the consumer state
2641                          * present in the session log?
2642                          */
2643                         if ( sl->sl_num > 0 ) {
2644                                 int i;
2645                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2646                                         /* SID not present == new enough */
2647                                         if ( minsid < sl->sl_sids[i] ) {
2648                                                 do_play = 1;
2649                                                 break;
2650                                         }
2651                                         /* SID present */
2652                                         if ( minsid == sl->sl_sids[i] ) {
2653                                                 /* new enough? */
2654                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2655                                                         do_play = 1;
2656                                                 break;
2657                                         }
2658                                 }
2659                                 /* SID not present == new enough */
2660                                 if ( i == sl->sl_numcsns )
2661                                         do_play = 1;
2662                         }
2663                         if ( do_play ) {
2664                                 do_present = 0;
2665                                 /* mutex is unlocked in playlog */
2666                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2667                         } else {
2668                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2669                         }
2670                 }
2671                 /* Is the CSN still present in the database? */
2672                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2673                         /* No, so a reload is required */
2674                         /* the 2.2 consumer doesn't send this hint */
2675                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2676                                 if ( ctxcsn )
2677                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2678                                 if ( sids )
2679                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2680                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2681                                 rs->sr_text = "sync cookie is stale";
2682                                 goto bailout;
2683                         }
2684                         if ( srs->sr_state.ctxcsn ) {
2685                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2686                                 srs->sr_state.ctxcsn = NULL;
2687                         }
2688                         if ( srs->sr_state.sids ) {
2689                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2690                                 srs->sr_state.sids = NULL;
2691                         }
2692                         srs->sr_state.numcsns = 0;
2693                 } else {
2694                         gotstate = 1;
2695                         /* If changed and doing Present lookup, send Present UUIDs */
2696                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2697                                 LDAP_SUCCESS ) {
2698                                 if ( ctxcsn )
2699                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2700                                 if ( sids )
2701                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2702                                 goto bailout;
2703                         }
2704                 }
2705         } else {
2706                 /* No consumer state, assume something has changed */
2707                 changed = SS_CHANGED;
2708         }
2709
2710 shortcut:
2711         /* Append CSN range to search filter, save original filter
2712          * for persistent search evaluation
2713          */
2714         if ( sop ) {
2715                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2716                 sop->s_filterstr = op->ors_filterstr;
2717                 /* correct the refcount that was set to 2 before */
2718                 sop->s_inuse--;
2719         }
2720
2721         /* If something changed, find the changes */
2722         if ( gotstate && ( changed || dirty ) ) {
2723                 Filter *fand, *fava;
2724
2725                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2726                 fand->f_choice = LDAP_FILTER_AND;
2727                 fand->f_next = NULL;
2728                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2729                 fand->f_and = fava;
2730                 fava->f_choice = LDAP_FILTER_GE;
2731                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2732                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2733 #ifdef LDAP_COMP_MATCH
2734                 fava->f_ava->aa_cf = NULL;
2735 #endif
2736                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2737                 fava->f_next = op->ors_filter;
2738                 op->ors_filter = fand;
2739                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2740                 if ( sop ) {
2741                         sop->s_flags |= PS_FIX_FILTER;
2742                 }
2743         }
2744         if ( sop ) {
2745                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2746         }
2747
2748         /* Let our callback add needed info to returned entries */
2749         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2750         ss = (searchstate *)(cb+1);
2751         ss->ss_on = on;
2752         ss->ss_so = sop;
2753         ss->ss_flags = do_present | changed;
2754         ss->ss_ctxcsn = ctxcsn;
2755         ss->ss_numcsns = numcsns;
2756         ss->ss_sids = sids;
2757         cb->sc_response = syncprov_search_response;
2758         cb->sc_private = ss;
2759         cb->sc_next = op->o_callback;
2760         op->o_callback = cb;
2761
2762         /* If this is a persistent search and no changes were reported during
2763          * the refresh phase, just invoke the response callback to transition
2764          * us into persist phase
2765          */
2766         if ( !changed && !dirty ) {
2767                 rs->sr_err = LDAP_SUCCESS;
2768                 rs->sr_nentries = 0;
2769                 send_ldap_result( op, rs );
2770                 return rs->sr_err;
2771         }
2772         return SLAP_CB_CONTINUE;
2773 }
2774
2775 static int
2776 syncprov_operational(
2777         Operation *op,
2778         SlapReply *rs )
2779 {
2780         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2781         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2782
2783         /* This prevents generating unnecessarily; frontend will strip
2784          * any statically stored copy.
2785          */
2786         if ( op->o_sync != SLAP_CONTROL_NONE )
2787                 return SLAP_CB_CONTINUE;
2788
2789         if ( rs->sr_entry &&
2790                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2791
2792                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2793                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2794                         Attribute *a, **ap = NULL;
2795
2796                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2797                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2798                                         break;
2799                         }
2800
2801                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2802                         if ( si->si_ctxcsn ) {
2803                                 if ( !a ) {
2804                                         for ( ap = &rs->sr_operational_attrs; *ap;
2805                                                 ap=&(*ap)->a_next );
2806
2807                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2808                                         *ap = a;
2809                                 }
2810
2811                                 if ( !ap ) {
2812                                         if ( rs_entry2modifiable( op, rs, on )) {
2813                                                 a = attr_find( rs->sr_entry->e_attrs,
2814                                                         slap_schema.si_ad_contextCSN );
2815                                         }
2816                                         if ( a->a_nvals != a->a_vals ) {
2817                                                 ber_bvarray_free( a->a_nvals );
2818                                         }
2819                                         a->a_nvals = NULL;
2820                                         ber_bvarray_free( a->a_vals );
2821                                         a->a_vals = NULL;
2822                                         a->a_numvals = 0;
2823                                 }
2824                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2825                         }
2826                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2827                 }
2828         }
2829         return SLAP_CB_CONTINUE;
2830 }
2831
2832 enum {
2833         SP_CHKPT = 1,
2834         SP_SESSL,
2835         SP_NOPRES,
2836         SP_USEHINT
2837 };
2838
2839 static ConfigDriver sp_cf_gen;
2840
2841 static ConfigTable spcfg[] = {
2842         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2843                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2844                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2845                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2846         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2847                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2848                         "DESC 'Session log size in ops' "
2849                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2850         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2851                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2852                         "DESC 'Omit Present phase processing' "
2853                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2854         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2855                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2856                         "DESC 'Observe Reload Hint in Request control' "
2857                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2858         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2859 };
2860
2861 static ConfigOCs spocs[] = {
2862         { "( OLcfgOvOc:1.1 "
2863                 "NAME 'olcSyncProvConfig' "
2864                 "DESC 'SyncRepl Provider configuration' "
2865                 "SUP olcOverlayConfig "
2866                 "MAY ( olcSpCheckpoint "
2867                         "$ olcSpSessionlog "
2868                         "$ olcSpNoPresent "
2869                         "$ olcSpReloadHint "
2870                 ") )",
2871                         Cft_Overlay, spcfg },
2872         { NULL, 0, NULL }
2873 };
2874
2875 static int
2876 sp_cf_gen(ConfigArgs *c)
2877 {
2878         slap_overinst           *on = (slap_overinst *)c->bi;
2879         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2880         int rc = 0;
2881
2882         if ( c->op == SLAP_CONFIG_EMIT ) {
2883                 switch ( c->type ) {
2884                 case SP_CHKPT:
2885                         if ( si->si_chkops || si->si_chktime ) {
2886                                 struct berval bv;
2887                                 /* we assume si_chktime is a multiple of 60
2888                                  * because the parsed value was originally
2889                                  * multiplied by 60 */
2890                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2891                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2892                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2893                                         rc = 1;
2894                                 } else {
2895                                         bv.bv_val = c->cr_msg;
2896                                         value_add_one( &c->rvalue_vals, &bv );
2897                                 }
2898                         } else {
2899                                 rc = 1;
2900                         }
2901                         break;
2902                 case SP_SESSL:
2903                         if ( si->si_logs ) {
2904                                 c->value_int = si->si_logs->sl_size;
2905                         } else {
2906                                 rc = 1;
2907                         }
2908                         break;
2909                 case SP_NOPRES:
2910                         if ( si->si_nopres ) {
2911                                 c->value_int = 1;
2912                         } else {
2913                                 rc = 1;
2914                         }
2915                         break;
2916                 case SP_USEHINT:
2917                         if ( si->si_usehint ) {
2918                                 c->value_int = 1;
2919                         } else {
2920                                 rc = 1;
2921                         }
2922                         break;
2923                 }
2924                 return rc;
2925         } else if ( c->op == LDAP_MOD_DELETE ) {
2926                 switch ( c->type ) {
2927                 case SP_CHKPT:
2928                         si->si_chkops = 0;
2929                         si->si_chktime = 0;
2930                         break;
2931                 case SP_SESSL:
2932                         if ( si->si_logs )
2933                                 si->si_logs->sl_size = 0;
2934                         else
2935                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2936                         break;
2937                 case SP_NOPRES:
2938                         if ( si->si_nopres )
2939                                 si->si_nopres = 0;
2940                         else
2941                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2942                         break;
2943                 case SP_USEHINT:
2944                         if ( si->si_usehint )
2945                                 si->si_usehint = 0;
2946                         else
2947                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2948                         break;
2949                 }
2950                 return rc;
2951         }
2952         switch ( c->type ) {
2953         case SP_CHKPT:
2954                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2955                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2956                                 c->argv[0], c->argv[1] );
2957                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2958                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2959                         return ARG_BAD_CONF;
2960                 }
2961                 if ( si->si_chkops <= 0 ) {
2962                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2963                                 c->argv[0], si->si_chkops );
2964                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2965                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2966                         return ARG_BAD_CONF;
2967                 }
2968                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2969                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2970                                 c->argv[0], c->argv[1] );
2971                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2972                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2973                         return ARG_BAD_CONF;
2974                 }
2975                 if ( si->si_chktime <= 0 ) {
2976                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2977                                 c->argv[0], si->si_chkops );
2978                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2979                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2980                         return ARG_BAD_CONF;
2981                 }
2982                 si->si_chktime *= 60;
2983                 break;
2984         case SP_SESSL: {
2985                 sessionlog *sl;
2986                 int size = c->value_int;
2987
2988                 if ( size < 0 ) {
2989                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2990                                 c->argv[0], size );
2991                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2992                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2993                         return ARG_BAD_CONF;
2994                 }
2995                 sl = si->si_logs;
2996                 if ( !sl ) {
2997                         sl = ch_malloc( sizeof( sessionlog ));
2998                         sl->sl_mincsn = NULL;
2999                         sl->sl_sids = NULL;
3000                         sl->sl_num = 0;
3001                         sl->sl_numcsns = 0;
3002                         sl->sl_head = sl->sl_tail = NULL;
3003                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
3004                         si->si_logs = sl;
3005                 }
3006                 sl->sl_size = size;
3007                 }
3008                 break;
3009         case SP_NOPRES:
3010                 si->si_nopres = c->value_int;
3011                 break;
3012         case SP_USEHINT:
3013                 si->si_usehint = c->value_int;
3014                 break;
3015         }
3016         return rc;
3017 }
3018
3019 /* ITS#3456 we cannot run this search on the main thread, must use a
3020  * child thread in order to insure we have a big enough stack.
3021  */
3022 static void *
3023 syncprov_db_otask(
3024         void *ptr
3025 )
3026 {
3027         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3028         return NULL;
3029 }
3030
3031
3032 /* Read any existing contextCSN from the underlying db.
3033  * Then search for any entries newer than that. If no value exists,
3034  * just generate it. Cache whatever result.
3035  */
3036 static int
3037 syncprov_db_open(
3038         BackendDB *be,
3039         ConfigReply *cr
3040 )
3041 {
3042         slap_overinst   *on = (slap_overinst *) be->bd_info;
3043         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3044
3045         Connection conn = { 0 };
3046         OperationBuffer opbuf;
3047         Operation *op;
3048         Entry *e = NULL;
3049         Attribute *a;
3050         int rc;
3051         void *thrctx = NULL;
3052
3053         if ( !SLAP_LASTMOD( be )) {
3054                 Debug( LDAP_DEBUG_ANY,
3055                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3056                 return -1;
3057         }
3058
3059         if ( slapMode & SLAP_TOOL_MODE ) {
3060                 return 0;
3061         }
3062
3063         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3064         if ( rc ) {
3065                 return rc;
3066         }
3067
3068         thrctx = ldap_pvt_thread_pool_context();
3069         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3070         op = &opbuf.ob_op;
3071         op->o_bd = be;
3072         op->o_dn = be->be_rootdn;
3073         op->o_ndn = be->be_rootndn;
3074
3075         if ( SLAP_SYNC_SUBENTRY( be )) {
3076                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3077                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3078         } else {
3079                 si->si_contextdn = be->be_nsuffix[0];
3080         }
3081         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3082                 slap_schema.si_ad_contextCSN, 0, &e, on );
3083
3084         if ( e ) {
3085                 ldap_pvt_thread_t tid;
3086
3087                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3088                 if ( a ) {
3089                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3090                         si->si_numcsns = a->a_numvals;
3091                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3092                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3093                 }
3094                 overlay_entry_release_ov( op, e, 0, on );
3095                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3096                         op->o_tag = LDAP_REQ_SEARCH;
3097                         op->o_req_dn = be->be_suffix[0];
3098                         op->o_req_ndn = be->be_nsuffix[0];
3099                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3100                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3101                         ldap_pvt_thread_join( tid, NULL );
3102                 }
3103         }
3104
3105         /* Didn't find a contextCSN, should we generate one? */
3106         if ( !si->si_ctxcsn ) {
3107                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3108                 struct berval csn;
3109
3110                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
3111                 /* If we're also a consumer, then don't generate anything.
3112                  * Wait for our provider to send it to us, or for a local
3113                  * modify if we have multimaster.
3114                  */
3115                         goto out;
3116                 }
3117                 csn.bv_val = csnbuf;
3118                 csn.bv_len = sizeof( csnbuf );
3119                 slap_get_csn( op, &csn, 0 );
3120                 value_add_one( &si->si_ctxcsn, &csn );
3121                 si->si_numcsns = 1;
3122                 si->si_sids = ch_malloc( sizeof(int) );
3123                 si->si_sids[0] = slap_serverID;
3124
3125                 /* make sure we do a checkpoint on close */
3126                 si->si_numops++;
3127         }
3128
3129         /* Initialize the sessionlog mincsn */
3130         if ( si->si_logs && si->si_numcsns ) {
3131                 sessionlog *sl = si->si_logs;
3132                 int i;
3133                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3134                 sl->sl_numcsns = si->si_numcsns;
3135                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3136                 for ( i=0; i < si->si_numcsns; i++ )
3137                         sl->sl_sids[i] = si->si_sids[i];
3138         }
3139
3140 out:
3141         op->o_bd->bd_info = (BackendInfo *)on;
3142         return 0;
3143 }
3144
3145 /* Write the current contextCSN into the underlying db.
3146  */
3147 static int
3148 syncprov_db_close(
3149         BackendDB *be,
3150         ConfigReply *cr
3151 )
3152 {
3153     slap_overinst   *on = (slap_overinst *) be->bd_info;
3154     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3155 #ifdef SLAP_CONFIG_DELETE
3156         syncops *so, *sonext;
3157 #endif /* SLAP_CONFIG_DELETE */
3158
3159         if ( slapMode & SLAP_TOOL_MODE ) {
3160                 return 0;
3161         }
3162         if ( si->si_numops ) {
3163                 Connection conn = {0};
3164                 OperationBuffer opbuf;
3165                 Operation *op;
3166                 void *thrctx;
3167
3168                 thrctx = ldap_pvt_thread_pool_context();
3169                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3170                 op = &opbuf.ob_op;
3171                 op->o_bd = be;
3172                 op->o_dn = be->be_rootdn;
3173                 op->o_ndn = be->be_rootndn;
3174                 syncprov_checkpoint( op, on );
3175         }
3176
3177 #ifdef SLAP_CONFIG_DELETE
3178         if ( !slapd_shutdown ) {
3179                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
3180                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3181                         SlapReply rs = {REP_RESULT};
3182                         rs.sr_err = LDAP_UNAVAILABLE;
3183                         send_ldap_result( so->s_op, &rs );
3184                         sonext=so->s_next;
3185                         syncprov_drop_psearch( so, 0);
3186                 }
3187                 si->si_ops=NULL;
3188                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
3189         }
3190         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3191 #endif /* SLAP_CONFIG_DELETE */
3192
3193     return 0;
3194 }
3195
3196 static int
3197 syncprov_db_init(
3198         BackendDB *be,
3199         ConfigReply *cr
3200 )
3201 {
3202         slap_overinst   *on = (slap_overinst *)be->bd_info;
3203         syncprov_info_t *si;
3204
3205         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3206                 Debug( LDAP_DEBUG_ANY,
3207                         "syncprov must be instantiated within a database.\n",
3208                         0, 0, 0 );
3209                 return 1;
3210         }
3211
3212         si = ch_calloc(1, sizeof(syncprov_info_t));
3213         on->on_bi.bi_private = si;
3214         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3215         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3216         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3217         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3218
3219         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3220         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3221         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3222         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3223
3224         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3225         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3226
3227         return 0;
3228 }
3229
3230 static int
3231 syncprov_db_destroy(
3232         BackendDB *be,
3233         ConfigReply *cr
3234 )
3235 {
3236         slap_overinst   *on = (slap_overinst *)be->bd_info;
3237         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3238
3239         if ( si ) {
3240                 if ( si->si_logs ) {
3241                         sessionlog *sl = si->si_logs;
3242                         slog_entry *se = sl->sl_head;
3243
3244                         while ( se ) {
3245                                 slog_entry *se_next = se->se_next;
3246                                 ch_free( se );
3247                                 se = se_next;
3248                         }
3249                         if ( sl->sl_mincsn )
3250                                 ber_bvarray_free( sl->sl_mincsn );
3251                         if ( sl->sl_sids )
3252                                 ch_free( sl->sl_sids );
3253
3254                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3255                         ch_free( si->si_logs );
3256                 }
3257                 if ( si->si_ctxcsn )
3258                         ber_bvarray_free( si->si_ctxcsn );
3259                 if ( si->si_sids )
3260                         ch_free( si->si_sids );
3261                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3262                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3263                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3264                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3265                 ch_free( si );
3266         }
3267
3268         return 0;
3269 }
3270
3271 static int syncprov_parseCtrl (
3272         Operation *op,
3273         SlapReply *rs,
3274         LDAPControl *ctrl )
3275 {
3276         ber_tag_t tag;
3277         BerElementBuffer berbuf;
3278         BerElement *ber = (BerElement *)&berbuf;
3279         ber_int_t mode;
3280         ber_len_t len;
3281         struct berval cookie = BER_BVNULL;
3282         sync_control *sr;
3283         int rhint = 0;
3284
3285         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3286                 rs->sr_text = "Sync control specified multiple times";
3287                 return LDAP_PROTOCOL_ERROR;
3288         }
3289
3290         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3291                 rs->sr_text = "Sync control specified with pagedResults control";
3292                 return LDAP_PROTOCOL_ERROR;
3293         }
3294
3295         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3296                 rs->sr_text = "Sync control value is absent";
3297                 return LDAP_PROTOCOL_ERROR;
3298         }
3299
3300         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3301                 rs->sr_text = "Sync control value is empty";
3302                 return LDAP_PROTOCOL_ERROR;
3303         }
3304
3305         /* Parse the control value
3306          *      syncRequestValue ::= SEQUENCE {
3307          *              mode   ENUMERATED {
3308          *                      -- 0 unused
3309          *                      refreshOnly             (1),
3310          *                      -- 2 reserved
3311          *                      refreshAndPersist       (3)
3312          *              },
3313          *              cookie  syncCookie OPTIONAL
3314          *      }
3315          */
3316
3317         ber_init2( ber, &ctrl->ldctl_value, 0 );
3318
3319         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3320                 rs->sr_text = "Sync control : mode decoding error";
3321                 return LDAP_PROTOCOL_ERROR;
3322         }
3323
3324         switch( mode ) {
3325         case LDAP_SYNC_REFRESH_ONLY:
3326                 mode = SLAP_SYNC_REFRESH;
3327                 break;
3328         case LDAP_SYNC_REFRESH_AND_PERSIST:
3329                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3330                 break;
3331         default:
3332                 rs->sr_text = "Sync control : unknown update mode";
3333                 return LDAP_PROTOCOL_ERROR;
3334         }
3335
3336         tag = ber_peek_tag( ber, &len );
3337
3338         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3339                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3340                         rs->sr_text = "Sync control : cookie decoding error";
3341                         return LDAP_PROTOCOL_ERROR;
3342                 }
3343                 tag = ber_peek_tag( ber, &len );
3344         }
3345         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3346                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3347                         rs->sr_text = "Sync control : rhint decoding error";
3348                         return LDAP_PROTOCOL_ERROR;
3349                 }
3350         }
3351         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3352                         rs->sr_text = "Sync control : decoding error";
3353                         return LDAP_PROTOCOL_ERROR;
3354         }
3355         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3356         sr->sr_rhint = rhint;
3357         if (!BER_BVISNULL(&cookie)) {
3358                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3359                 /* If parse fails, pretend no cookie was sent */
3360                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3361                         sr->sr_state.rid == -1 ) {
3362                         if ( sr->sr_state.ctxcsn ) {
3363                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3364                                 sr->sr_state.ctxcsn = NULL;
3365                         }
3366                         sr->sr_state.numcsns = 0;
3367                 }
3368         }
3369
3370         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3371
3372         op->o_sync = ctrl->ldctl_iscritical
3373                 ? SLAP_CONTROL_CRITICAL
3374                 : SLAP_CONTROL_NONCRITICAL;
3375
3376         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3377
3378         return LDAP_SUCCESS;
3379 }
3380
3381 /* This overlay is set up for dynamic loading via moduleload. For static
3382  * configuration, you'll need to arrange for the slap_overinst to be
3383  * initialized and registered by some other function inside slapd.
3384  */
3385
3386 static slap_overinst            syncprov;
3387
3388 int
3389 syncprov_initialize()
3390 {
3391         int rc;
3392
3393         rc = register_supported_control( LDAP_CONTROL_SYNC,
3394                 SLAP_CTRL_SEARCH, NULL,
3395                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3396         if ( rc != LDAP_SUCCESS ) {
3397                 Debug( LDAP_DEBUG_ANY,
3398                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3399                 return rc;
3400         }
3401
3402         syncprov.on_bi.bi_type = "syncprov";
3403         syncprov.on_bi.bi_db_init = syncprov_db_init;
3404         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3405         syncprov.on_bi.bi_db_open = syncprov_db_open;
3406         syncprov.on_bi.bi_db_close = syncprov_db_close;
3407
3408         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3409         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3410
3411         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3412         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3413         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3414         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3415         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3416         syncprov.on_bi.bi_op_search = syncprov_op_search;
3417         syncprov.on_bi.bi_extended = syncprov_op_extended;
3418         syncprov.on_bi.bi_operational = syncprov_operational;
3419
3420         syncprov.on_bi.bi_cf_ocs = spocs;
3421
3422         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3423
3424         rc = config_register_schema( spcfg, spocs );
3425         if ( rc ) return rc;
3426
3427         return overlay_register( &syncprov );
3428 }
3429
3430 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3431 int
3432 init_module( int argc, char *argv[] )
3433 {
3434         return syncprov_initialize();
3435 }
3436 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3437
3438 #endif /* defined(SLAPD_OVER_SYNCPROV) */