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 2004-2011 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         Operation *mt_op;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* A queued result of a persistent search */
  49 typedef struct syncres {
  50         struct syncres *s_next;
  51         Entry *s_e;
  52         struct berval s_dn;
  53         struct berval s_ndn;
  54         struct berval s_uuid;
  55         struct berval s_csn;
  56         char s_mode;
  57         char s_isreference;
  58 } syncres;
  59
  60 /* Record of a persistent search */
  61 typedef struct syncops {
  62         struct syncops *s_next;
  63         struct berval   s_base;         /* ndn of search base */
  64         ID              s_eid;          /* entryID of search base */
  65         Operation       *s_op;          /* search op */
  66         int             s_rid;
  67         int             s_sid;
  68         struct berval s_filterstr;
  69         int             s_flags;        /* search status */
  70 #define PS_IS_REFRESHING        0x01
  71 #define PS_IS_DETACHED          0x02
  72 #define PS_WROTE_BASE           0x04
  73 #define PS_FIND_BASE            0x08
  74 #define PS_FIX_FILTER           0x10
  75 #define PS_TASK_QUEUED          0x20
  76
  77         int             s_inuse;        /* reference count */
  78         struct syncres *s_res;
  79         struct syncres *s_restail;
  80         ldap_pvt_thread_mutex_t s_mutex;
  81 } syncops;
  82
  83 /* A received sync control */
  84 typedef struct sync_control {
  85         struct sync_cookie sr_state;
  86         int sr_rhint;
  87 } sync_control;
  88
  89 #if 0 /* moved back to slap.h */
  90 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  91 #endif
  92 /* o_sync_mode uses data bits of o_sync */
  93 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  94
  95 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  97 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  98 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  99
 100 /* Record of which searches matched at premodify step */
 101 typedef struct syncmatches {
 102         struct syncmatches *sm_next;
 103         syncops *sm_op;
 104 } syncmatches;
 105
 106 /* Session log data */
 107 typedef struct slog_entry {
 108         struct slog_entry *se_next;
 109         struct berval se_uuid;
 110         struct berval se_csn;
 111         int     se_sid;
 112         ber_tag_t       se_tag;
 113 } slog_entry;
 114
 115 typedef struct sessionlog {
 116         struct berval   sl_mincsn;
 117         int             sl_num;
 118         int             sl_size;
 119         slog_entry *sl_head;
 120         slog_entry *sl_tail;
 121         ldap_pvt_thread_mutex_t sl_mutex;
 122 } sessionlog;
 123
 124 /* The main state for this overlay */
 125 typedef struct syncprov_info_t {
 126         syncops         *si_ops;
 127         BerVarray       si_ctxcsn;      /* ldapsync context */
 128         struct berval   si_contextdn;
 129         int             *si_sids;
 130         int             si_numcsns;
 131         int             si_chkops;      /* checkpointing info */
 132         int             si_chktime;
 133         int             si_numops;      /* number of ops since last checkpoint */
 134         int             si_nopres;      /* Skip present phase */
 135         int             si_usehint;     /* use reload hint */
 136         int             si_active;      /* True if there are active mods */
 137         int             si_dirty;       /* True if the context is dirty, i.e changes
 138                                                  * have been made without updating the csn. */
 139         time_t  si_chklast;     /* time of last checkpoint */
 140         Avlnode *si_mods;       /* entries being modified */
 141         sessionlog      *si_logs;
 142         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 143         ldap_pvt_thread_mutex_t si_ops_mutex;
 144         ldap_pvt_thread_mutex_t si_mods_mutex;
 145         ldap_pvt_thread_mutex_t si_resp_mutex;
 146 } syncprov_info_t;
 147
 148 typedef struct opcookie {
 149         slap_overinst *son;
 150         syncmatches *smatches;
 151         modtarget *smt;
 152         Entry *se;
 153         struct berval sdn;      /* DN of entry, for deletes */
 154         struct berval sndn;
 155         struct berval suuid;    /* UUID of entry */
 156         struct berval sctxcsn;
 157         short osid;     /* sid of op csn */
 158         short rsid;     /* sid of relay */
 159         short sreference;       /* Is the entry a reference? */
 160 } opcookie;
 161
 162 typedef struct mutexint {
 163         ldap_pvt_thread_mutex_t mi_mutex;
 164         int mi_int;
 165 } mutexint;
 166
 167 typedef struct fbase_cookie {
 168         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 169         syncops *fss;   /* persistent search we're testing against */
 170         int fbase;      /* if TRUE we found the search base and it's still valid */
 171         int fscope;     /* if TRUE then fdn is within the psearch scope */
 172 } fbase_cookie;
 173
 174 static AttributeName csn_anlist[3];
 175 static AttributeName uuid_anlist[2];
 176
 177 /* Build a LDAPsync intermediate state control */
 178 static int
 179 syncprov_state_ctrl(
 180         Operation       *op,
 181         SlapReply       *rs,
 182         Entry           *e,
 183         int             entry_sync_state,
 184         LDAPControl     **ctrls,
 185         int             num_ctrls,
 186         int             send_cookie,
 187         struct berval   *cookie )
 188 {
 189         Attribute* a;
 190         int ret;
 191
 192         BerElementBuffer berbuf;
 193         BerElement *ber = (BerElement *)&berbuf;
 194
 195         struct berval   entryuuid_bv = BER_BVNULL;
 196
 197         ber_init2( ber, 0, LBER_USE_DER );
 198         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 199
 200         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 201
 202         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 203                 AttributeDescription *desc = a->a_desc;
 204                 if ( desc == slap_schema.si_ad_entryUUID ) {
 205                         entryuuid_bv = a->a_nvals[0];
 206                         break;
 207                 }
 208         }
 209
 210         /* FIXME: what if entryuuid is NULL or empty ? */
 211
 212         if ( send_cookie && cookie ) {
 213                 ber_printf( ber, "{eOON}",
 214                         entry_sync_state, &entryuuid_bv, cookie );
 215         } else {
 216                 ber_printf( ber, "{eON}",
 217                         entry_sync_state, &entryuuid_bv );
 218         }
 219
 220         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 221         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 222         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 223
 224         ber_free_buf( ber );
 225
 226         if ( ret < 0 ) {
 227                 Debug( LDAP_DEBUG_TRACE,
 228                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 229                         0, 0, 0 );
 230                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 231                 return ret;
 232         }
 233
 234         return LDAP_SUCCESS;
 235 }
 236
 237 /* Build a LDAPsync final state control */
 238 static int
 239 syncprov_done_ctrl(
 240         Operation       *op,
 241         SlapReply       *rs,
 242         LDAPControl     **ctrls,
 243         int                     num_ctrls,
 244         int                     send_cookie,
 245         struct berval *cookie,
 246         int                     refreshDeletes )
 247 {
 248         int ret;
 249         BerElementBuffer berbuf;
 250         BerElement *ber = (BerElement *)&berbuf;
 251
 252         ber_init2( ber, NULL, LBER_USE_DER );
 253         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 254
 255         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 256
 257         ber_printf( ber, "{" );
 258         if ( send_cookie && cookie ) {
 259                 ber_printf( ber, "O", cookie );
 260         }
 261         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 262                 ber_printf( ber, "b", refreshDeletes );
 263         }
 264         ber_printf( ber, "N}" );
 265
 266         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 267         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 268         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 269
 270         ber_free_buf( ber );
 271
 272         if ( ret < 0 ) {
 273                 Debug( LDAP_DEBUG_TRACE,
 274                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 275                         0, 0, 0 );
 276                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 277                 return ret;
 278         }
 279
 280         return LDAP_SUCCESS;
 281 }
 282
 283 static int
 284 syncprov_sendinfo(
 285         Operation       *op,
 286         SlapReply       *rs,
 287         int                     type,
 288         struct berval *cookie,
 289         int                     refreshDone,
 290         BerVarray       syncUUIDs,
 291         int                     refreshDeletes )
 292 {
 293         BerElementBuffer berbuf;
 294         BerElement *ber = (BerElement *)&berbuf;
 295         struct berval rspdata;
 296
 297         int ret;
 298
 299         ber_init2( ber, NULL, LBER_USE_DER );
 300         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 301
 302         if ( type ) {
 303                 switch ( type ) {
 304                 case LDAP_TAG_SYNC_NEW_COOKIE:
 305                         ber_printf( ber, "tO", type, cookie );
 306                         break;
 307                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 308                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 309                         ber_printf( ber, "t{", type );
 310                         if ( cookie ) {
 311                                 ber_printf( ber, "O", cookie );
 312                         }
 313                         if ( refreshDone == 0 ) {
 314                                 ber_printf( ber, "b", refreshDone );
 315                         }
 316                         ber_printf( ber, "N}" );
 317                         break;
 318                 case LDAP_TAG_SYNC_ID_SET:
 319                         ber_printf( ber, "t{", type );
 320                         if ( cookie ) {
 321                                 ber_printf( ber, "O", cookie );
 322                         }
 323                         if ( refreshDeletes == 1 ) {
 324                                 ber_printf( ber, "b", refreshDeletes );
 325                         }
 326                         ber_printf( ber, "[W]", syncUUIDs );
 327                         ber_printf( ber, "N}" );
 328                         break;
 329                 default:
 330                         Debug( LDAP_DEBUG_TRACE,
 331                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 332                                 type, 0, 0 );
 333                         return LDAP_OTHER;
 334                 }
 335         }
 336
 337         ret = ber_flatten2( ber, &rspdata, 0 );
 338
 339         if ( ret < 0 ) {
 340                 Debug( LDAP_DEBUG_TRACE,
 341                         "syncprov_sendinfo: ber_flatten2 failed\n",
 342                         0, 0, 0 );
 343                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 344                 return ret;
 345         }
 346
 347         rs->sr_rspoid = LDAP_SYNC_INFO;
 348         rs->sr_rspdata = &rspdata;
 349         send_ldap_intermediate( op, rs );
 350         rs->sr_rspdata = NULL;
 351         ber_free_buf( ber );
 352
 353         return LDAP_SUCCESS;
 354 }
 355
 356 /* Find a modtarget in an AVL tree */
 357 static int
 358 sp_avl_cmp( const void *c1, const void *c2 )
 359 {
 360         const modtarget *m1, *m2;
 361         int rc;
 362
 363         m1 = c1; m2 = c2;
 364         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 365
 366         if ( rc ) return rc;
 367         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 368 }
 369
 370 /* syncprov_findbase:
 371  *   finds the true DN of the base of a search (with alias dereferencing) and
 372  * checks to make sure the base entry doesn't get replaced with a different
 373  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 374  * change is detected, any persistent search on this base must be terminated /
 375  * reloaded.
 376  *   On the first call, we just save the DN and entryID. On subsequent calls
 377  * we compare the DN and entryID with the saved values.
 378  */
 379 static int
 380 findbase_cb( Operation *op, SlapReply *rs )
 381 {
 382         slap_callback *sc = op->o_callback;
 383
 384         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 385                 fbase_cookie *fc = sc->sc_private;
 386
 387                 /* If no entryID, we're looking for the first time.
 388                  * Just store whatever we got.
 389                  */
 390                 if ( fc->fss->s_eid == NOID ) {
 391                         fc->fbase = 2;
 392                         fc->fss->s_eid = rs->sr_entry->e_id;
 393                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 394
 395                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 396                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 397
 398                 /* OK, the DN is the same and the entryID is the same. */
 399                         fc->fbase = 1;
 400                 }
 401         }
 402         if ( rs->sr_err != LDAP_SUCCESS ) {
 403                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 404         }
 405         return LDAP_SUCCESS;
 406 }
 407
 408 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 409 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 410
 411 static int
 412 syncprov_findbase( Operation *op, fbase_cookie *fc )
 413 {
 414         /* Use basic parameters from syncrepl search, but use
 415          * current op's threadctx / tmpmemctx
 416          */
 417         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 418         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 419                 slap_callback cb = {0};
 420                 Operation fop;
 421                 SlapReply frs = { REP_RESULT };
 422                 int rc;
 423
 424                 fc->fss->s_flags ^= PS_FIND_BASE;
 425                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 426
 427                 fop = *fc->fss->s_op;
 428
 429                 fop.o_bd = fop.o_bd->bd_self;
 430                 fop.o_hdr = op->o_hdr;
 431                 fop.o_time = op->o_time;
 432                 fop.o_tincr = op->o_tincr;
 433
 434                 cb.sc_response = findbase_cb;
 435                 cb.sc_private = fc;
 436
 437                 fop.o_sync_mode = 0;    /* turn off sync mode */
 438                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 439                 fop.o_callback = &cb;
 440                 fop.o_tag = LDAP_REQ_SEARCH;
 441                 fop.ors_scope = LDAP_SCOPE_BASE;
 442                 fop.ors_limit = NULL;
 443                 fop.ors_slimit = 1;
 444                 fop.ors_tlimit = SLAP_NO_LIMIT;
 445                 fop.ors_attrs = slap_anlist_no_attrs;
 446                 fop.ors_attrsonly = 1;
 447                 fop.ors_filter = &generic_filter;
 448                 fop.ors_filterstr = generic_filterstr;
 449
 450                 rc = fop.o_bd->be_search( &fop, &frs );
 451         } else {
 452                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 453                 fc->fbase = 1;
 454         }
 455
 456         /* After the first call, see if the fdn resides in the scope */
 457         if ( fc->fbase == 1 ) {
 458                 switch ( fc->fss->s_op->ors_scope ) {
 459                 case LDAP_SCOPE_BASE:
 460                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 461                         break;
 462                 case LDAP_SCOPE_ONELEVEL: {
 463                         struct berval pdn;
 464                         dnParent( fc->fdn, &pdn );
 465                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 466                         break; }
 467                 case LDAP_SCOPE_SUBTREE:
 468                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 469                         break;
 470                 case LDAP_SCOPE_SUBORDINATE:
 471                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 472                                 !dn_match( fc->fdn, &fc->fss->s_base );
 473                         break;
 474                 }
 475         }
 476
 477         if ( fc->fbase )
 478                 return LDAP_SUCCESS;
 479
 480         /* If entryID has changed, then the base of this search has
 481          * changed. Invalidate the psearch.
 482          */
 483         return LDAP_NO_SUCH_OBJECT;
 484 }
 485
 486 /* syncprov_findcsn:
 487  *   This function has three different purposes, but they all use a search
 488  * that filters on entryCSN so they're combined here.
 489  * 1: at startup time, after a contextCSN has been read from the database,
 490  * we search for all entries with CSN >= contextCSN in case the contextCSN
 491  * was not checkpointed at the previous shutdown.
 492  *
 493  * 2: when the current contextCSN is known and we have a sync cookie, we search
 494  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 495  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 496  *
 497  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 498  * CSN, and generate Present records for them. We always collect this result
 499  * in SyncID sets, even if there's only one match.
 500  */
 501 typedef enum find_csn_t {
 502         FIND_MAXCSN     = 1,
 503         FIND_CSN        = 2,
 504         FIND_PRESENT    = 3
 505 } find_csn_t;
 506
 507 static int
 508 findmax_cb( Operation *op, SlapReply *rs )
 509 {
 510         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 511                 struct berval *maxcsn = op->o_callback->sc_private;
 512                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 513                         slap_schema.si_ad_entryCSN );
 514
 515                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 516                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 517                         maxcsn->bv_len = a->a_vals[0].bv_len;
 518                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 519                 }
 520         }
 521         return LDAP_SUCCESS;
 522 }
 523
 524 static int
 525 findcsn_cb( Operation *op, SlapReply *rs )
 526 {
 527         slap_callback *sc = op->o_callback;
 528
 529         /* We just want to know that at least one exists, so it's OK if
 530          * we exceed the unchecked limit.
 531          */
 532         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 533                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 534                 sc->sc_private = (void *)1;
 535         }
 536         return LDAP_SUCCESS;
 537 }
 538
 539 /* Build a list of entryUUIDs for sending in a SyncID set */
 540
 541 #define UUID_LEN        16
 542
 543 typedef struct fpres_cookie {
 544         int num;
 545         BerVarray uuids;
 546         char *last;
 547 } fpres_cookie;
 548
 549 static int
 550 findpres_cb( Operation *op, SlapReply *rs )
 551 {
 552         slap_callback *sc = op->o_callback;
 553         fpres_cookie *pc = sc->sc_private;
 554         Attribute *a;
 555         int ret = SLAP_CB_CONTINUE;
 556
 557         switch ( rs->sr_type ) {
 558         case REP_SEARCH:
 559                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 560                 if ( a ) {
 561                         pc->uuids[pc->num].bv_val = pc->last;
 562                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 563                                 pc->uuids[pc->num].bv_len );
 564                         pc->num++;
 565                         pc->last = pc->uuids[pc->num].bv_val;
 566                         pc->uuids[pc->num].bv_val = NULL;
 567                 }
 568                 ret = LDAP_SUCCESS;
 569                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 570                         break;
 571                 /* FALLTHRU */
 572         case REP_RESULT:
 573                 ret = rs->sr_err;
 574                 if ( pc->num ) {
 575                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 576                                 0, pc->uuids, 0 );
 577                         pc->uuids[pc->num].bv_val = pc->last;
 578                         pc->num = 0;
 579                         pc->last = pc->uuids[0].bv_val;
 580                 }
 581                 break;
 582         default:
 583                 break;
 584         }
 585         return ret;
 586 }
 587
 588 static int
 589 syncprov_findcsn( Operation *op, find_csn_t mode )
 590 {
 591         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 592         syncprov_info_t         *si = on->on_bi.bi_private;
 593
 594         slap_callback cb = {0};
 595         Operation fop;
 596         SlapReply frs = { REP_RESULT };
 597         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 598         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 599         struct berval maxcsn;
 600         Filter cf;
 601         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 602         fpres_cookie pcookie;
 603         sync_control *srs = NULL;
 604         struct slap_limits_set fc_limits;
 605         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 606         int maxid;
 607
 608         if ( mode != FIND_MAXCSN ) {
 609                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 610         }
 611
 612         fop = *op;
 613         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 614         /* We want pure entries, not referrals */
 615         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 616
 617         cf.f_ava = &eq;
 618         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 619         BER_BVZERO( &cf.f_av_value );
 620         cf.f_next = NULL;
 621
 622         fop.o_callback = &cb;
 623         fop.ors_limit = NULL;
 624         fop.ors_tlimit = SLAP_NO_LIMIT;
 625         fop.ors_filter = &cf;
 626         fop.ors_filterstr.bv_val = buf;
 627
 628 again:
 629         switch( mode ) {
 630         case FIND_MAXCSN:
 631                 cf.f_choice = LDAP_FILTER_GE;
 632                 /* If there are multiple CSNs, use the one with our serverID */
 633                 for ( i=0; i<si->si_numcsns; i++) {
 634                         if ( slap_serverID == si->si_sids[i] ) {
 635                                 maxid = i;
 636                                 break;
 637                         }
 638                 }
 639                 if ( i == si->si_numcsns ) {
 640                         /* No match: this is multimaster, and none of the content in the DB
 641                          * originated locally. Treat like no CSN.
 642                          */
 643                         return LDAP_NO_SUCH_OBJECT;
 644                 }
 645                 cf.f_av_value = si->si_ctxcsn[maxid];
 646                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 647                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 648                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 649                         return LDAP_OTHER;
 650                 }
 651                 fop.ors_attrsonly = 0;
 652                 fop.ors_attrs = csn_anlist;
 653                 fop.ors_slimit = SLAP_NO_LIMIT;
 654                 cb.sc_private = &maxcsn;
 655                 cb.sc_response = findmax_cb;
 656                 strcpy( cbuf, cf.f_av_value.bv_val );
 657                 maxcsn.bv_val = cbuf;
 658                 maxcsn.bv_len = cf.f_av_value.bv_len;
 659                 break;
 660         case FIND_CSN:
 661                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 662                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 663                         /* If there are multiple CSNs, use the smallest */
 664                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 665                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 666                                         > 0 ) {
 667                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 668                                 }
 669                         }
 670                 }
 671                 /* Look for exact match the first time */
 672                 if ( findcsn_retry ) {
 673                         cf.f_choice = LDAP_FILTER_EQUALITY;
 674                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 675                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 676                 /* On retry, look for <= */
 677                 } else {
 678                         cf.f_choice = LDAP_FILTER_LE;
 679                         fop.ors_limit = &fc_limits;
 680                         memset( &fc_limits, 0, sizeof( fc_limits ));
 681                         fc_limits.lms_s_unchecked = 1;
 682                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 683                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 684                 }
 685                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 686                         return LDAP_OTHER;
 687                 }
 688                 fop.ors_attrsonly = 1;
 689                 fop.ors_attrs = slap_anlist_no_attrs;
 690                 fop.ors_slimit = 1;
 691                 cb.sc_private = NULL;
 692                 cb.sc_response = findcsn_cb;
 693                 break;
 694         case FIND_PRESENT:
 695                 fop.ors_filter = op->ors_filter;
 696                 fop.ors_filterstr = op->ors_filterstr;
 697                 fop.ors_attrsonly = 0;
 698                 fop.ors_attrs = uuid_anlist;
 699                 fop.ors_slimit = SLAP_NO_LIMIT;
 700                 cb.sc_private = &pcookie;
 701                 cb.sc_response = findpres_cb;
 702                 pcookie.num = 0;
 703
 704                 /* preallocate storage for a full set */
 705                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 706                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 707                         op->o_tmpmemctx );
 708                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 709                 pcookie.uuids[0].bv_val = pcookie.last;
 710                 pcookie.uuids[0].bv_len = UUID_LEN;
 711                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 712                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 713                         pcookie.uuids[i].bv_len = UUID_LEN;
 714                 }
 715                 break;
 716         }
 717
 718         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 719         fop.o_bd->be_search( &fop, &frs );
 720         fop.o_bd->bd_info = (BackendInfo *)on;
 721
 722         switch( mode ) {
 723         case FIND_MAXCSN:
 724                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 725 #ifdef CHECK_CSN
 726                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 727                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 728 #endif
 729                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 730                         si->si_numops++;        /* ensure a checkpoint */
 731                 }
 732                 break;
 733         case FIND_CSN:
 734                 /* If matching CSN was not found, invalidate the context. */
 735                 if ( !cb.sc_private ) {
 736                         /* If we didn't find an exact match, then try for <= */
 737                         if ( findcsn_retry ) {
 738                                 findcsn_retry = 0;
 739                                 goto again;
 740                         }
 741                         rc = LDAP_NO_SUCH_OBJECT;
 742                 }
 743                 break;
 744         case FIND_PRESENT:
 745                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 746                 break;
 747         }
 748
 749         return rc;
 750 }
 751
 752 /* Should find a place to cache these */
 753 static mutexint *get_mutexint()
 754 {
 755         mutexint *mi = ch_malloc( sizeof( mutexint ));
 756         ldap_pvt_thread_mutex_init( &mi->mi_mutex );
 757         mi->mi_int = 1;
 758         return mi;
 759 }
 760
 761 static void inc_mutexint( mutexint *mi )
 762 {
 763         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 764         mi->mi_int++;
 765         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 766 }
 767
 768 /* return resulting counter */
 769 static int dec_mutexint( mutexint *mi )
 770 {
 771         int i;
 772         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 773         i = --mi->mi_int;
 774         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 775         if ( !i ) {
 776                 ldap_pvt_thread_mutex_destroy( &mi->mi_mutex );
 777                 ch_free( mi );
 778         }
 779         return i;
 780 }
 781
 782 static void
 783 syncprov_free_syncop( syncops *so )
 784 {
 785         syncres *sr, *srnext;
 786         GroupAssertion *ga, *gnext;
 787
 788         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 789         /* already being freed, or still in use */
 790         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 791                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 792                 return;
 793         }
 794         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 795         if ( so->s_flags & PS_IS_DETACHED ) {
 796                 filter_free( so->s_op->ors_filter );
 797                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 798                         gnext = ga->ga_next;
 799                         ch_free( ga );
 800                 }
 801                 ch_free( so->s_op );
 802         }
 803         ch_free( so->s_base.bv_val );
 804         for ( sr=so->s_res; sr; sr=srnext ) {
 805                 srnext = sr->s_next;
 806                 if ( sr->s_e ) {
 807                         if ( !dec_mutexint( sr->s_e->e_private )) {
 808                                 sr->s_e->e_private = NULL;
 809                                 entry_free( sr->s_e );
 810                         }
 811                 }
 812                 ch_free( sr );
 813         }
 814         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 815         ch_free( so );
 816 }
 817
 818 /* Send a persistent search response */
 819 static int
 820 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, int mode )
 821 {
 822         slap_overinst *on = opc->son;
 823
 824         SlapReply rs = { REP_SEARCH };
 825         LDAPControl *ctrls[2];
 826         struct berval cookie = BER_BVNULL, csns[2];
 827         Entry e_uuid = {0};
 828         Attribute a_uuid = {0};
 829
 830         if ( so->s_op->o_abandon )
 831                 return SLAPD_ABANDON;
 832
 833         ctrls[1] = NULL;
 834         if ( !BER_BVISNULL( &opc->sctxcsn )) {
 835                 csns[0] = opc->sctxcsn;
 836                 BER_BVZERO( &csns[1] );
 837                 slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 838         }
 839
 840 #ifdef LDAP_DEBUG
 841         if ( so->s_sid > 0 ) {
 842                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 843                         so->s_sid, cookie.bv_val ? cookie.bv_val : "", 0 );
 844         } else {
 845                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 846                         cookie.bv_val ? cookie.bv_val : "", 0, 0 );
 847         }
 848 #endif
 849
 850         e_uuid.e_attrs = &a_uuid;
 851         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 852         a_uuid.a_nvals = &opc->suuid;
 853         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 854                 mode, ctrls, 0, 1, &cookie );
 855         if ( !BER_BVISNULL( &cookie )) {
 856                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 857         }
 858
 859         rs.sr_ctrls = ctrls;
 860         rs.sr_entry = &e_uuid;
 861         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 862                 e_uuid = *opc->se;
 863                 e_uuid.e_private = NULL;
 864         }
 865
 866         switch( mode ) {
 867         case LDAP_SYNC_ADD:
 868                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 869                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 870                         rs.sr_err = send_search_reference( op, &rs );
 871                         ber_bvarray_free( rs.sr_ref );
 872                         break;
 873                 }
 874                 /* fallthru */
 875         case LDAP_SYNC_MODIFY:
 876                 rs.sr_attrs = op->ors_attrs;
 877                 rs.sr_err = send_search_entry( op, &rs );
 878                 break;
 879         case LDAP_SYNC_DELETE:
 880                 e_uuid.e_attrs = NULL;
 881                 e_uuid.e_name = opc->sdn;
 882                 e_uuid.e_nname = opc->sndn;
 883                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 884                         struct berval bv = BER_BVNULL;
 885                         rs.sr_ref = &bv;
 886                         rs.sr_err = send_search_reference( op, &rs );
 887                 } else {
 888                         rs.sr_err = send_search_entry( op, &rs );
 889                 }
 890                 break;
 891         default:
 892                 assert(0);
 893         }
 894         /* In case someone else freed it already? */
 895         if ( rs.sr_ctrls ) {
 896                 int i;
 897                 for ( i=0; rs.sr_ctrls[i]; i++ ) {
 898                         if ( rs.sr_ctrls[i] == ctrls[0] ) {
 899                                 op->o_tmpfree( ctrls[0]->ldctl_value.bv_val, op->o_tmpmemctx );
 900                                 ctrls[0]->ldctl_value.bv_val = NULL;
 901                                 break;
 902                         }
 903                 }
 904                 rs.sr_ctrls = NULL;
 905         }
 906
 907         return rs.sr_err;
 908 }
 909
 910 static void
 911 syncprov_qstart( syncops *so );
 912
 913 /* Play back queued responses */
 914 static int
 915 syncprov_qplay( Operation *op, syncops *so )
 916 {
 917         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 918         syncres *sr;
 919         Entry *e;
 920         opcookie opc;
 921         int rc = 0;
 922
 923         opc.son = on;
 924
 925         do {
 926                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 927                 sr = so->s_res;
 928                 if ( sr )
 929                         so->s_res = sr->s_next;
 930                 if ( !so->s_res )
 931                         so->s_restail = NULL;
 932                 /* Exit loop with mutex held */
 933                 if ( !sr || so->s_op->o_abandon )
 934                         break;
 935                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 936
 937                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 938                         SlapReply rs = { REP_INTERMEDIATE };
 939
 940                         rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 941                                 &sr->s_csn, 0, NULL, 0 );
 942                 } else {
 943                         opc.sdn = sr->s_dn;
 944                         opc.sndn = sr->s_ndn;
 945                         opc.suuid = sr->s_uuid;
 946                         opc.sctxcsn = sr->s_csn;
 947                         opc.sreference = sr->s_isreference;
 948                         opc.se = sr->s_e;
 949
 950                         rc = syncprov_sendresp( op, &opc, so, sr->s_mode );
 951
 952                 }
 953                 if ( sr->s_e ) {
 954                         if ( !dec_mutexint( sr->s_e->e_private )) {
 955                                 sr->s_e->e_private = NULL;
 956                                 entry_free ( sr->s_e );
 957                         }
 958                 }
 959
 960                 ch_free( sr );
 961
 962                 /* Exit loop with mutex held */
 963                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 964
 965         } while (0);
 966
 967         /* We now only send one change at a time, to prevent one
 968          * psearch from hogging all the CPU. Resubmit this task if
 969          * there are more responses queued and no errors occurred.
 970          */
 971
 972         if ( rc == 0 && so->s_res ) {
 973                 syncprov_qstart( so );
 974         } else {
 975                 so->s_flags ^= PS_TASK_QUEUED;
 976         }
 977
 978         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 979         return rc;
 980 }
 981
 982 /* task for playing back queued responses */
 983 static void *
 984 syncprov_qtask( void *ctx, void *arg )
 985 {
 986         syncops *so = arg;
 987         OperationBuffer opbuf;
 988         Operation *op;
 989         BackendDB be;
 990         int rc;
 991
 992         op = &opbuf.ob_op;
 993         *op = *so->s_op;
 994         op->o_hdr = &opbuf.ob_hdr;
 995         op->o_controls = opbuf.ob_controls;
 996         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 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         syncprov_free_syncop( so );
1111
1112         return 0;
1113 }
1114
1115 static int
1116 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1117 {
1118         slap_callback *sc = op->o_callback;
1119         op->o_callback = sc->sc_next;
1120         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1121         op->o_tmpfree( sc, op->o_tmpmemctx );
1122         return 0;
1123 }
1124
1125 static int
1126 syncprov_op_abandon( Operation *op, SlapReply *rs )
1127 {
1128         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1129         syncprov_info_t         *si = on->on_bi.bi_private;
1130         syncops *so, *soprev;
1131
1132         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1133         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1134                 soprev=so, so=so->s_next ) {
1135                 if ( so->s_op->o_connid == op->o_connid &&
1136                         so->s_op->o_msgid == op->orn_msgid ) {
1137                                 so->s_op->o_abandon = 1;
1138                                 soprev->s_next = so->s_next;
1139                                 break;
1140                 }
1141         }
1142         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1143         if ( so ) {
1144                 /* Is this really a Cancel exop? */
1145                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1146                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1147                         rs->sr_err = LDAP_CANCELLED;
1148                         send_ldap_result( so->s_op, rs );
1149                         if ( so->s_flags & PS_IS_DETACHED ) {
1150                                 slap_callback *cb;
1151                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1152                                 cb->sc_cleanup = syncprov_ab_cleanup;
1153                                 cb->sc_next = op->o_callback;
1154                                 cb->sc_private = so;
1155                                 return SLAP_CB_CONTINUE;
1156                         }
1157                 }
1158                 syncprov_drop_psearch( so, 0 );
1159         }
1160         return SLAP_CB_CONTINUE;
1161 }
1162
1163 /* Find which persistent searches are affected by this operation */
1164 static void
1165 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1166 {
1167         slap_overinst *on = opc->son;
1168         syncprov_info_t         *si = on->on_bi.bi_private;
1169
1170         fbase_cookie fc;
1171         syncops *ss, *sprev, *snext;
1172         Entry *e = NULL;
1173         Attribute *a;
1174         int rc;
1175         struct berval newdn;
1176         int freefdn = 0;
1177         BackendDB *b0 = op->o_bd, db;
1178
1179         fc.fdn = &op->o_req_ndn;
1180         /* compute new DN */
1181         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1182                 struct berval pdn;
1183                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1184                 else dnParent( fc.fdn, &pdn );
1185                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1186                 fc.fdn = &newdn;
1187                 freefdn = 1;
1188         }
1189         if ( op->o_tag != LDAP_REQ_ADD ) {
1190                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1191                         db = *op->o_bd;
1192                         op->o_bd = &db;
1193                 }
1194                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1195                 /* If we're sending responses now, make a copy and unlock the DB */
1196                 if ( e && !saveit ) {
1197                         if ( !opc->se ) {
1198                                 opc->se = entry_dup( e );
1199                                 opc->se->e_private = get_mutexint();
1200                         }
1201                         overlay_entry_release_ov( op, e, 0, on );
1202                         e = opc->se;
1203                 }
1204                 if ( rc ) {
1205                         op->o_bd = b0;
1206                         return;
1207                 }
1208         } else {
1209                 e = op->ora_e;
1210                 if ( !saveit ) {
1211                         if ( !opc->se ) {
1212                                 opc->se = entry_dup( e );
1213                                 opc->se->e_private = get_mutexint();
1214                         }
1215                         e = opc->se;
1216                 }
1217         }
1218
1219         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1220                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1221                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1222                 opc->sreference = is_entry_referral( e );
1223                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1224                 if ( a )
1225                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1226         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1227                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1228                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1229                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1230                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1231         }
1232
1233         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1234         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1235                 sprev = ss, ss=snext)
1236         {
1237                 Operation op2;
1238                 Opheader oh;
1239                 syncmatches *sm;
1240                 int found = 0;
1241
1242                 snext = ss->s_next;
1243                 if ( ss->s_op->o_abandon )
1244                         continue;
1245
1246                 /* Don't send ops back to the originator */
1247                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1248                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1249                                 opc->osid, 0, 0 );
1250                         continue;
1251                 }
1252
1253                 /* Don't send ops back to the messenger */
1254                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1255                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1256                                 opc->rsid, 0, 0 );
1257                         continue;
1258                 }
1259
1260                 /* validate base */
1261                 fc.fss = ss;
1262                 fc.fbase = 0;
1263                 fc.fscope = 0;
1264
1265                 /* If the base of the search is missing, signal a refresh */
1266                 rc = syncprov_findbase( op, &fc );
1267                 if ( rc != LDAP_SUCCESS ) {
1268                         SlapReply rs = {REP_RESULT};
1269                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1270                                 "search base has changed" );
1271                         sprev->s_next = snext;
1272                         syncprov_drop_psearch( ss, 1 );
1273                         ss = sprev;
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                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1316                         rc = test_filter( &op2, e, op2.ors_filter );
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                         syncprov_free_syncop( ss );
1348                 }
1349         }
1350         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1351
1352         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1353                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1354                         op->o_bd = &db;
1355                 }
1356                 if ( saveit )
1357                         overlay_entry_release_ov( op, e, 0, on );
1358                 op->o_bd = b0;
1359         }
1360         if ( opc->se && !saveit ) {
1361                 if ( !dec_mutexint( opc->se->e_private )) {
1362                         opc->se->e_private = NULL;
1363                         entry_free( opc->se );
1364                         opc->se = NULL;
1365                 }
1366         }
1367         if ( freefdn ) {
1368                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1369         }
1370         op->o_bd = b0;
1371 }
1372
1373 static int
1374 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1375 {
1376         slap_callback *cb = op->o_callback;
1377         opcookie *opc = cb->sc_private;
1378         slap_overinst *on = opc->son;
1379         syncprov_info_t         *si = on->on_bi.bi_private;
1380         syncmatches *sm, *snext;
1381         modtarget *mt, mtdummy;
1382
1383         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1384         if ( si->si_active )
1385                 si->si_active--;
1386         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1387
1388         for (sm = opc->smatches; sm; sm=snext) {
1389                 snext = sm->sm_next;
1390                 syncprov_free_syncop( sm->sm_op );
1391                 op->o_tmpfree( sm, op->o_tmpmemctx );
1392         }
1393
1394         /* Remove op from lock table */
1395         mt = opc->smt;
1396         if ( mt ) {
1397                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1398                 mt->mt_mods = mt->mt_mods->mi_next;
1399                 /* If there are more, promote the next one */
1400                 if ( mt->mt_mods ) {
1401                         mt->mt_op = mt->mt_mods->mi_op;
1402                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1403                 } else {
1404                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1405                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1406                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1407                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1408                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1409                         ch_free( mt );
1410                 }
1411         }
1412         if ( !BER_BVISNULL( &opc->suuid ))
1413                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1414         if ( !BER_BVISNULL( &opc->sndn ))
1415                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1416         if ( !BER_BVISNULL( &opc->sdn ))
1417                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1418         op->o_callback = cb->sc_next;
1419         op->o_tmpfree(cb, op->o_tmpmemctx);
1420
1421         return 0;
1422 }
1423
1424 static void
1425 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1426 {
1427         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1428         Modifications mod;
1429         Operation opm;
1430         SlapReply rsm = { 0 };
1431         slap_callback cb = {0};
1432         BackendDB be;
1433         BackendInfo *bi;
1434
1435 #ifdef CHECK_CSN
1436         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1437
1438         int i;
1439         for ( i=0; i<si->si_numcsns; i++ ) {
1440                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1441         }
1442 #endif
1443         mod.sml_numvals = si->si_numcsns;
1444         mod.sml_values = si->si_ctxcsn;
1445         mod.sml_nvalues = NULL;
1446         mod.sml_desc = slap_schema.si_ad_contextCSN;
1447         mod.sml_op = LDAP_MOD_REPLACE;
1448         mod.sml_flags = SLAP_MOD_INTERNAL;
1449         mod.sml_next = NULL;
1450
1451         cb.sc_response = slap_null_cb;
1452         opm = *op;
1453         opm.o_tag = LDAP_REQ_MODIFY;
1454         opm.o_callback = &cb;
1455         opm.orm_modlist = &mod;
1456         opm.orm_no_opattrs = 1;
1457         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1458                 be = *on->on_info->oi_origdb;
1459                 opm.o_bd = &be;
1460         }
1461         opm.o_req_dn = si->si_contextdn;
1462         opm.o_req_ndn = si->si_contextdn;
1463         bi = opm.o_bd->bd_info;
1464         opm.o_bd->bd_info = on->on_info->oi_orig;
1465         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1466         opm.o_no_schema_check = 1;
1467         opm.o_bd->be_modify( &opm, &rsm );
1468
1469         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1470                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1471                 const char      *text;
1472                 char txtbuf[SLAP_TEXT_BUFLEN];
1473                 size_t textlen = sizeof txtbuf;
1474                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1475                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1476                 opm.ora_e = e;
1477                 opm.o_bd->be_add( &opm, &rsm );
1478                 if ( e == opm.ora_e )
1479                         be_entry_release_w( &opm, opm.ora_e );
1480         }
1481         opm.o_bd->bd_info = bi;
1482
1483         if ( mod.sml_next != NULL ) {
1484                 slap_mods_free( mod.sml_next, 1 );
1485         }
1486 #ifdef CHECK_CSN
1487         for ( i=0; i<si->si_numcsns; i++ ) {
1488                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1489         }
1490 #endif
1491 }
1492
1493 static void
1494 syncprov_add_slog( Operation *op )
1495 {
1496         opcookie *opc = op->o_callback->sc_private;
1497         slap_overinst *on = opc->son;
1498         syncprov_info_t         *si = on->on_bi.bi_private;
1499         sessionlog *sl;
1500         slog_entry *se;
1501
1502         sl = si->si_logs;
1503         {
1504                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1505                         /* During the syncrepl refresh phase we can receive operations
1506                          * without a csn.  We cannot reliably determine the consumers
1507                          * state with respect to such operations, so we ignore them and
1508                          * wipe out anything in the log if we see them.
1509                          */
1510                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1511                         while ( se = sl->sl_head ) {
1512                                 sl->sl_head = se->se_next;
1513                                 ch_free( se );
1514                         }
1515                         sl->sl_tail = NULL;
1516                         sl->sl_num = 0;
1517                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1518                         return;
1519                 }
1520
1521                 /* Allocate a record. UUIDs are not NUL-terminated. */
1522                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1523                         op->o_csn.bv_len + 1 );
1524                 se->se_next = NULL;
1525                 se->se_tag = op->o_tag;
1526
1527                 se->se_uuid.bv_val = (char *)(&se[1]);
1528                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1529                 se->se_uuid.bv_len = opc->suuid.bv_len;
1530
1531                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1532                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1533                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1534                 se->se_csn.bv_len = op->o_csn.bv_len;
1535                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1536
1537                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1538                 if ( sl->sl_head ) {
1539                         /* Keep the list in csn order. */
1540                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1541                                 sl->sl_tail->se_next = se;
1542                                 sl->sl_tail = se;
1543                         } else {
1544                                 slog_entry **sep;
1545
1546                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1547                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1548                                                 se->se_next = *sep;
1549                                                 *sep = se;
1550                                                 break;
1551                                         }
1552                                 }
1553                         }
1554                 } else {
1555                         sl->sl_head = se;
1556                         sl->sl_tail = se;
1557                 }
1558                 sl->sl_num++;
1559                 while ( sl->sl_num > sl->sl_size ) {
1560                         se = sl->sl_head;
1561                         sl->sl_head = se->se_next;
1562                         AC_MEMCPY( sl->sl_mincsn.bv_val, se->se_csn.bv_val, se->se_csn.bv_len );
1563                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1564                         ch_free( se );
1565                         sl->sl_num--;
1566                 }
1567                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1568         }
1569 }
1570
1571 /* Just set a flag if we found the matching entry */
1572 static int
1573 playlog_cb( Operation *op, SlapReply *rs )
1574 {
1575         if ( rs->sr_type == REP_SEARCH ) {
1576                 op->o_callback->sc_private = (void *)1;
1577         }
1578         return rs->sr_err;
1579 }
1580
1581 /* enter with sl->sl_mutex locked, release before returning */
1582 static void
1583 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1584         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1585 {
1586         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1587         slog_entry *se;
1588         int i, j, ndel, num, nmods, mmods;
1589         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1590         BerVarray uuids;
1591         struct berval delcsn[2];
1592
1593         if ( !sl->sl_num ) {
1594                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1595                 return;
1596         }
1597
1598         num = sl->sl_num;
1599         i = 0;
1600         nmods = 0;
1601
1602         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1603                 num * UUID_LEN, op->o_tmpmemctx );
1604         uuids[0].bv_val = (char *)(uuids + num + 1);
1605
1606         delcsn[0].bv_len = 0;
1607         delcsn[0].bv_val = cbuf;
1608         BER_BVZERO(&delcsn[1]);
1609
1610         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1611          * and everything else at the end. Do this first so we can
1612          * unlock the list mutex.
1613          */
1614         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1615                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1616         for ( se=sl->sl_head; se; se=se->se_next ) {
1617                 int k;
1618                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1619                 ndel = 1;
1620                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1621                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1622                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1623                                 break;
1624                         }
1625                 }
1626                 if ( ndel <= 0 ) {
1627                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1628                         continue;
1629                 }
1630                 ndel = 0;
1631                 for ( k=0; k<numcsns; k++ ) {
1632                         if ( se->se_sid == sids[k] ) {
1633                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1634                                 break;
1635                         }
1636                 }
1637                 if ( ndel > 0 ) {
1638                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1639                         break;
1640                 }
1641                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1642                         j = i;
1643                         i++;
1644                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1645                         delcsn[0].bv_len = se->se_csn.bv_len;
1646                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1647                 } else {
1648                         if ( se->se_tag == LDAP_REQ_ADD )
1649                                 continue;
1650                         nmods++;
1651                         j = num - nmods;
1652                 }
1653                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1654                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1655                 uuids[j].bv_len = UUID_LEN;
1656         }
1657         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1658
1659         ndel = i;
1660
1661         /* Zero out unused slots */
1662         for ( i=ndel; i < num - nmods; i++ )
1663                 uuids[i].bv_len = 0;
1664
1665         /* Mods must be validated to see if they belong in this delete set.
1666          */
1667
1668         mmods = nmods;
1669         /* Strip any duplicates */
1670         for ( i=0; i<nmods; i++ ) {
1671                 for ( j=0; j<ndel; j++ ) {
1672                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1673                                 uuids[num - 1 - i].bv_len = 0;
1674                                 mmods --;
1675                                 break;
1676                         }
1677                 }
1678                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1679                 for ( j=0; j<i; j++ ) {
1680                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1681                                 uuids[num - 1 - i].bv_len = 0;
1682                                 mmods --;
1683                                 break;
1684                         }
1685                 }
1686         }
1687
1688         if ( mmods ) {
1689                 Operation fop;
1690                 SlapReply frs = { REP_RESULT };
1691                 int rc;
1692                 Filter mf, af;
1693                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1694                 slap_callback cb = {0};
1695
1696                 fop = *op;
1697
1698                 fop.o_sync_mode = 0;
1699                 fop.o_callback = &cb;
1700                 fop.ors_limit = NULL;
1701                 fop.ors_tlimit = SLAP_NO_LIMIT;
1702                 fop.ors_attrs = slap_anlist_all_attributes;
1703                 fop.ors_attrsonly = 0;
1704                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1705
1706                 af.f_choice = LDAP_FILTER_AND;
1707                 af.f_next = NULL;
1708                 af.f_and = &mf;
1709                 mf.f_choice = LDAP_FILTER_EQUALITY;
1710                 mf.f_ava = &eq;
1711                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1712                 mf.f_next = fop.ors_filter;
1713
1714                 fop.ors_filter = &af;
1715
1716                 cb.sc_response = playlog_cb;
1717                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1718
1719                 for ( i=ndel; i<num; i++ ) {
1720                         if ( uuids[i].bv_len == 0 ) continue;
1721
1722                         mf.f_av_value = uuids[i];
1723                         cb.sc_private = NULL;
1724                         fop.ors_slimit = 1;
1725                         frs.sr_nentries = 0;
1726                         rc = fop.o_bd->be_search( &fop, &frs );
1727
1728                         /* If entry was not found, add to delete list */
1729                         if ( !cb.sc_private ) {
1730                                 uuids[ndel++] = uuids[i];
1731                         }
1732                 }
1733                 fop.o_bd->bd_info = (BackendInfo *)on;
1734         }
1735         if ( ndel ) {
1736                 struct berval cookie;
1737
1738                 if ( delcsn[0].bv_len ) {
1739                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1740                                 slap_serverID ? slap_serverID : -1 );
1741
1742                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1743                 }
1744
1745                 uuids[ndel].bv_val = NULL;
1746                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1747                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1748                 if ( delcsn[0].bv_len ) {
1749                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1750                 }
1751         }
1752         op->o_tmpfree( uuids, op->o_tmpmemctx );
1753 }
1754
1755 static int
1756 syncprov_op_response( Operation *op, SlapReply *rs )
1757 {
1758         opcookie *opc = op->o_callback->sc_private;
1759         slap_overinst *on = opc->son;
1760         syncprov_info_t         *si = on->on_bi.bi_private;
1761         syncmatches *sm;
1762
1763         if ( rs->sr_err == LDAP_SUCCESS )
1764         {
1765                 struct berval maxcsn;
1766                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1767                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1768
1769                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1770
1771                 /* Update our context CSN */
1772                 cbuf[0] = '\0';
1773                 maxcsn.bv_val = cbuf;
1774                 maxcsn.bv_len = sizeof(cbuf);
1775                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1776
1777                 slap_get_commit_csn( op, &maxcsn, &foundit );
1778                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1779                         /* syncrepl queues the CSN values in the db where
1780                          * it is configured , not where the changes are made.
1781                          * So look for a value in the glue db if we didn't
1782                          * find any in this db.
1783                          */
1784                         BackendDB *be = op->o_bd;
1785                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1786                         maxcsn.bv_val = cbuf;
1787                         maxcsn.bv_len = sizeof(cbuf);
1788                         slap_get_commit_csn( op, &maxcsn, &foundit );
1789                         op->o_bd = be;
1790                 }
1791                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1792                         int i, sid;
1793 #ifdef CHECK_CSN
1794                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1795                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1796 #endif
1797                         sid = slap_parse_csn_sid( &maxcsn );
1798                         for ( i=0; i<si->si_numcsns; i++ ) {
1799                                 if ( sid == si->si_sids[i] ) {
1800                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1801                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1802                                                 csn_changed = 1;
1803                                         }
1804                                         break;
1805                                 }
1806                         }
1807                         /* It's a new SID for us */
1808                         if ( i == si->si_numcsns ) {
1809                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1810                                 csn_changed = 1;
1811                                 si->si_numcsns++;
1812                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1813                                         sizeof(int));
1814                                 si->si_sids[i] = sid;
1815                         }
1816                 }
1817
1818                 /* Don't do any processing for consumer contextCSN updates */
1819                 if ( op->o_dont_replicate ) {
1820                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1821                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1822                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1823                         /* Catch contextCSN updates from syncrepl. We have to look at
1824                          * all the attribute values, as there may be more than one csn
1825                          * that changed, and only one can be passed in the csn queue.
1826                          */
1827                         Modifications *mod = op->orm_modlist;
1828                         unsigned i;
1829                         int j, sid;
1830
1831                         for ( i=0; i<mod->sml_numvals; i++ ) {
1832                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1833                                 for ( j=0; j<si->si_numcsns; j++ ) {
1834                                         if ( sid == si->si_sids[j] ) {
1835                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1836                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1837                                                         csn_changed = 1;
1838                                                 }
1839                                                 break;
1840                                         }
1841                                 }
1842
1843                                 if ( j == si->si_numcsns ) {
1844                                         value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
1845                                         si->si_numcsns++;
1846                                         si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1847                                                 sizeof(int));
1848                                         si->si_sids[j] = sid;
1849                                         csn_changed = 1;
1850                                 }
1851                         }
1852                         if ( csn_changed )
1853                                 si->si_dirty = 0;
1854                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1855
1856                         if ( csn_changed ) {
1857                                 syncops *ss;
1858                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1859                                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1860                                         if ( ss->s_op->o_abandon )
1861                                                 continue;
1862                                         /* Send the updated csn to all syncrepl consumers,
1863                                          * including the server from which it originated.
1864                                          * The syncrepl consumer and syncprov provider on
1865                                          * the originating server may be configured to store
1866                                          * their csn values in different entries.
1867                                          */
1868                                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1869                                 }
1870                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1871                         }
1872                         } else {
1873                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1874                         }
1875                         goto leave;
1876                 }
1877
1878                 si->si_numops++;
1879                 if ( si->si_chkops || si->si_chktime ) {
1880                         /* Never checkpoint adding the context entry,
1881                          * it will deadlock
1882                          */
1883                         if ( op->o_tag != LDAP_REQ_ADD ||
1884                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1885                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1886                                         do_check = 1;
1887                                         si->si_numops = 0;
1888                                 }
1889                                 if ( si->si_chktime &&
1890                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1891                                         if ( si->si_chklast ) {
1892                                                 do_check = 1;
1893                                                 si->si_chklast = op->o_time;
1894                                         } else {
1895                                                 si->si_chklast = 1;
1896                                         }
1897                                 }
1898                         }
1899                 }
1900                 si->si_dirty = !csn_changed;
1901                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1902
1903                 if ( do_check ) {
1904                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1905                         syncprov_checkpoint( op, rs, on );
1906                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1907                 }
1908
1909                 /* only update consumer ctx if this is a newer csn */
1910                 if ( csn_changed ) {
1911                         opc->sctxcsn = maxcsn;
1912                 }
1913
1914                 /* Handle any persistent searches */
1915                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1916                 have_psearches = ( si->si_ops != NULL );
1917                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1918                 if ( have_psearches ) {
1919                         switch(op->o_tag) {
1920                         case LDAP_REQ_ADD:
1921                         case LDAP_REQ_MODIFY:
1922                         case LDAP_REQ_MODRDN:
1923                         case LDAP_REQ_EXTENDED:
1924                                 syncprov_matchops( op, opc, 0 );
1925                                 break;
1926                         case LDAP_REQ_DELETE:
1927                                 /* for each match in opc->smatches:
1928                                  *   send DELETE msg
1929                                  */
1930                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1931                                         if ( sm->sm_op->s_op->o_abandon )
1932                                                 continue;
1933                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1934                                 }
1935                                 break;
1936                         }
1937                 }
1938
1939                 /* Add any log records */
1940                 if ( si->si_logs ) {
1941                         syncprov_add_slog( op );
1942                 }
1943 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1944         }
1945         return SLAP_CB_CONTINUE;
1946 }
1947
1948 /* We don't use a subentry to store the context CSN any more.
1949  * We expose the current context CSN as an operational attribute
1950  * of the suffix entry.
1951  */
1952 static int
1953 syncprov_op_compare( Operation *op, SlapReply *rs )
1954 {
1955         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1956         syncprov_info_t         *si = on->on_bi.bi_private;
1957         int rc = SLAP_CB_CONTINUE;
1958
1959         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1960                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1961         {
1962                 Entry e = {0};
1963                 Attribute a = {0};
1964
1965                 e.e_name = si->si_contextdn;
1966                 e.e_nname = si->si_contextdn;
1967                 e.e_attrs = &a;
1968
1969                 a.a_desc = slap_schema.si_ad_contextCSN;
1970
1971                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1972
1973                 a.a_vals = si->si_ctxcsn;
1974                 a.a_nvals = a.a_vals;
1975                 a.a_numvals = si->si_numcsns;
1976
1977                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1978                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1979                 if ( ! rs->sr_err ) {
1980                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1981                         goto return_results;
1982                 }
1983
1984                 if ( get_assert( op ) &&
1985                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1986                 {
1987                         rs->sr_err = LDAP_ASSERTION_FAILED;
1988                         goto return_results;
1989                 }
1990
1991
1992                 rs->sr_err = LDAP_COMPARE_FALSE;
1993
1994                 if ( attr_valfind( &a,
1995                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1996                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1997                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1998                 {
1999                         rs->sr_err = LDAP_COMPARE_TRUE;
2000                 }
2001
2002 return_results:;
2003
2004                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2005
2006                 send_ldap_result( op, rs );
2007
2008                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2009                         rs->sr_err = LDAP_SUCCESS;
2010                 }
2011                 rc = rs->sr_err;
2012         }
2013
2014         return rc;
2015 }
2016
2017 static int
2018 syncprov_op_mod( Operation *op, SlapReply *rs )
2019 {
2020         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2021         syncprov_info_t         *si = on->on_bi.bi_private;
2022         slap_callback *cb;
2023         opcookie *opc;
2024         int have_psearches, cbsize;
2025
2026         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2027         have_psearches = ( si->si_ops != NULL );
2028         si->si_active++;
2029         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2030
2031         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2032                 (have_psearches ? sizeof(modinst) : 0 );
2033
2034         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2035         opc = (opcookie *)(cb+1);
2036         opc->son = on;
2037         cb->sc_response = syncprov_op_response;
2038         cb->sc_cleanup = syncprov_op_cleanup;
2039         cb->sc_private = opc;
2040         cb->sc_next = op->o_callback;
2041         op->o_callback = cb;
2042
2043         opc->osid = -1;
2044         opc->rsid = -1;
2045         if ( op->o_csn.bv_val ) {
2046                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2047         }
2048         if ( op->o_controls ) {
2049                 struct sync_cookie *scook =
2050                 op->o_controls[slap_cids.sc_LDAPsync];
2051                 if ( scook )
2052                         opc->rsid = scook->sid;
2053         }
2054
2055         /* If there are active persistent searches, lock this operation.
2056          * See seqmod.c for the locking logic on its own.
2057          */
2058         if ( have_psearches ) {
2059                 modtarget *mt, mtdummy;
2060                 modinst *mi;
2061
2062                 mi = (modinst *)(opc+1);
2063                 mi->mi_op = op;
2064
2065                 /* See if we're already modifying this entry... */
2066                 mtdummy.mt_op = op;
2067                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2068                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2069                 if ( mt ) {
2070                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2071                         if ( mt->mt_mods == NULL ) {
2072                                 /* Cannot reuse this mt, as another thread is about
2073                                  * to release it in syncprov_op_cleanup.
2074                                  */
2075                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2076                                 mt = NULL;
2077                         }
2078                 }
2079                 if ( mt ) {
2080                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2081                         mt->mt_tail->mi_next = mi;
2082                         mt->mt_tail = mi;
2083                         /* wait for this op to get to head of list */
2084                         while ( mt->mt_mods != mi ) {
2085                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2086                                 /* FIXME: if dynamic config can delete overlays or
2087                                  * databases we'll have to check for cleanup here.
2088                                  * Currently it's not an issue because there are
2089                                  * no dynamic config deletes...
2090                                  */
2091                                 if ( slapd_shutdown )
2092                                         return SLAPD_ABANDON;
2093
2094                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2095                                         ldap_pvt_thread_yield();
2096                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2097
2098                                 /* clean up if the caller is giving up */
2099                                 if ( op->o_abandon ) {
2100                                         modinst *m2;
2101                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
2102                                                 m2 = m2->mi_next );
2103                                         m2->mi_next = mi->mi_next;
2104                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2105                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2106                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2107                                         return SLAPD_ABANDON;
2108                                 }
2109                         }
2110                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2111                 } else {
2112                         /* Record that we're modifying this entry now */
2113                         mt = ch_malloc( sizeof(modtarget) );
2114                         mt->mt_mods = mi;
2115                         mt->mt_tail = mi;
2116                         mt->mt_op = mi->mi_op;
2117                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2118                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2119                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2120                 }
2121                 opc->smt = mt;
2122         }
2123
2124         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2125                 syncprov_matchops( op, opc, 1 );
2126
2127         return SLAP_CB_CONTINUE;
2128 }
2129
2130 static int
2131 syncprov_op_extended( Operation *op, SlapReply *rs )
2132 {
2133         if ( exop_is_write( op ))
2134                 return syncprov_op_mod( op, rs );
2135
2136         return SLAP_CB_CONTINUE;
2137 }
2138
2139 typedef struct searchstate {
2140         slap_overinst *ss_on;
2141         syncops *ss_so;
2142         BerVarray ss_ctxcsn;
2143         int *ss_sids;
2144         int ss_numcsns;
2145 #define SS_PRESENT      0x01
2146 #define SS_CHANGED      0x02
2147         int ss_flags;
2148 } searchstate;
2149
2150 static int
2151 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2152 {
2153         if ( rs->sr_ctrls ) {
2154                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2155                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2156                 rs->sr_ctrls = NULL;
2157         }
2158         return 0;
2159 }
2160
2161 typedef struct SyncOperationBuffer {
2162         Operation               sob_op;
2163         Opheader                sob_hdr;
2164         OpExtra                 sob_oe;
2165         AttributeName   sob_extra;      /* not always present */
2166         /* Further data allocated here */
2167 } SyncOperationBuffer;
2168
2169 static void
2170 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2171 {
2172         SyncOperationBuffer *sopbuf2;
2173         Operation *op2;
2174         int i, alen = 0;
2175         size_t size;
2176         char *ptr;
2177         GroupAssertion *g1, *g2;
2178
2179         /* count the search attrs */
2180         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2181                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2182         }
2183         /* Make a new copy of the operation */
2184         size = offsetof( SyncOperationBuffer, sob_extra ) +
2185                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2186                 op->o_req_dn.bv_len + 1 +
2187                 op->o_req_ndn.bv_len + 1 +
2188                 op->o_ndn.bv_len + 1 +
2189                 so->s_filterstr.bv_len + 1;
2190         sopbuf2 = ch_calloc( 1, size );
2191         op2 = &sopbuf2->sob_op;
2192         op2->o_hdr = &sopbuf2->sob_hdr;
2193         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2194
2195         /* Copy the fields we care about explicitly, leave the rest alone */
2196         *op2->o_hdr = *op->o_hdr;
2197         op2->o_tag = op->o_tag;
2198         op2->o_time = op->o_time;
2199         op2->o_bd = on->on_info->oi_origdb;
2200         op2->o_request = op->o_request;
2201         op2->o_managedsait = op->o_managedsait;
2202         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2203         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2204
2205         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2206         if ( i ) {
2207                 op2->ors_attrs = (AttributeName *) ptr;
2208                 ptr = (char *) &op2->ors_attrs[i+1];
2209                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2210                         op2->ors_attrs[i] = op->ors_attrs[i];
2211                         op2->ors_attrs[i].an_name.bv_val = ptr;
2212                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2213                 }
2214                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2215         }
2216
2217         op2->o_authz = op->o_authz;
2218         op2->o_ndn.bv_val = ptr;
2219         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2220         op2->o_dn = op2->o_ndn;
2221         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2222         op2->o_req_dn.bv_val = ptr;
2223         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2224         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2225         op2->o_req_ndn.bv_val = ptr;
2226         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2227         op2->ors_filterstr.bv_val = ptr;
2228         strcpy( ptr, so->s_filterstr.bv_val );
2229         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2230
2231         /* Skip the AND/GE clause that we stuck on in front */
2232         if ( so->s_flags & PS_FIX_FILTER ) {
2233                 op2->ors_filter = op->ors_filter->f_and->f_next;
2234                 so->s_flags ^= PS_FIX_FILTER;
2235         } else {
2236                 op2->ors_filter = op->ors_filter;
2237         }
2238         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2239         so->s_op = op2;
2240
2241         /* Copy any cached group ACLs individually */
2242         op2->o_groups = NULL;
2243         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2244                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2245                 *g2 = *g1;
2246                 strcpy( g2->ga_ndn, g1->ga_ndn );
2247                 g2->ga_next = op2->o_groups;
2248                 op2->o_groups = g2;
2249         }
2250         /* Don't allow any further group caching */
2251         op2->o_do_not_cache = 1;
2252
2253         /* Add op2 to conn so abandon will find us */
2254         op->o_conn->c_n_ops_executing++;
2255         op->o_conn->c_n_ops_completed--;
2256         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2257         so->s_flags |= PS_IS_DETACHED;
2258
2259         /* Prevent anyone else from trying to send a result for this op */
2260         op->o_abandon = 1;
2261 }
2262
2263 static int
2264 syncprov_search_response( Operation *op, SlapReply *rs )
2265 {
2266         searchstate *ss = op->o_callback->sc_private;
2267         slap_overinst *on = ss->ss_on;
2268         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2269         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2270
2271         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2272                 Attribute *a;
2273                 /* If we got a referral without a referral object, there's
2274                  * something missing that we cannot replicate. Just ignore it.
2275                  * The consumer will abort because we didn't send the expected
2276                  * control.
2277                  */
2278                 if ( !rs->sr_entry ) {
2279                         assert( rs->sr_entry != NULL );
2280                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2281                         return SLAP_CB_CONTINUE;
2282                 }
2283                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2284                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2285                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2286                 }
2287                 if ( a ) {
2288                         int i, sid;
2289                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2290
2291                         /* Don't send changed entries back to the originator */
2292                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2293                                 Debug( LDAP_DEBUG_SYNC,
2294                                         "Entry %s changed by peer, ignored\n",
2295                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2296                                 return LDAP_SUCCESS;
2297                         }
2298
2299                         /* If not a persistent search */
2300                         if ( !ss->ss_so ) {
2301                                 /* Make sure entry is less than the snapshot'd contextCSN */
2302                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2303                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2304                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2305                                                 Debug( LDAP_DEBUG_SYNC,
2306                                                         "Entry %s CSN %s greater than snapshot %s\n",
2307                                                         rs->sr_entry->e_name.bv_val,
2308                                                         a->a_nvals[0].bv_val,
2309                                                         ss->ss_ctxcsn[i].bv_val );
2310                                                 return LDAP_SUCCESS;
2311                                         }
2312                                 }
2313                         }
2314
2315                         /* Don't send old entries twice */
2316                         if ( srs->sr_state.ctxcsn ) {
2317                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2318                                         if ( sid == srs->sr_state.sids[i] &&
2319                                                 ber_bvcmp( &a->a_nvals[0],
2320                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2321                                                 Debug( LDAP_DEBUG_SYNC,
2322                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2323                                                         rs->sr_entry->e_name.bv_val,
2324                                                         a->a_nvals[0].bv_val,
2325                                                         srs->sr_state.ctxcsn[i].bv_val );
2326                                                 return LDAP_SUCCESS;
2327                                         }
2328                                 }
2329                         }
2330                 }
2331                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2332                         op->o_tmpmemctx );
2333                 rs->sr_ctrls[1] = NULL;
2334                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2335                 /* If we're in delta-sync mode, always send a cookie */
2336                 if ( si->si_nopres && si->si_usehint && a ) {
2337                         struct berval cookie;
2338                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2339                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2340                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2341                 } else {
2342                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2343                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2344                 }
2345         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2346                 struct berval cookie = BER_BVNULL;
2347
2348                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2349                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2350                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2351                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2352
2353                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2354                 }
2355
2356                 /* Is this a regular refresh?
2357                  * Note: refresh never gets here if there were no changes
2358                  */
2359                 if ( !ss->ss_so ) {
2360                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2361                                 op->o_tmpmemctx );
2362                         rs->sr_ctrls[1] = NULL;
2363                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2364                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2365                                         LDAP_SYNC_REFRESH_DELETES );
2366                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2367                 } else {
2368                 /* It's RefreshAndPersist, transition to Persist phase */
2369                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2370                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2371                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2372                                 1, NULL, 0 );
2373                         if ( !BER_BVISNULL( &cookie ))
2374                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2375
2376                         /* Detach this Op from frontend control */
2377                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2378
2379                         /* But not if this connection was closed along the way */
2380                         if ( op->o_abandon ) {
2381                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2382                                 /* syncprov_ab_cleanup will free this syncop */
2383                                 return SLAPD_ABANDON;
2384
2385                         } else {
2386                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2387                                 /* Turn off the refreshing flag */
2388                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2389
2390                                 syncprov_detach_op( op, ss->ss_so, on );
2391
2392                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2393
2394                                 /* If there are queued responses, fire them off */
2395                                 if ( ss->ss_so->s_res )
2396                                         syncprov_qstart( ss->ss_so );
2397                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2398                         }
2399
2400                         return LDAP_SUCCESS;
2401                 }
2402         }
2403
2404         return SLAP_CB_CONTINUE;
2405 }
2406
2407 static int
2408 syncprov_op_search( Operation *op, SlapReply *rs )
2409 {
2410         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2411         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2412         slap_callback   *cb;
2413         int gotstate = 0, changed = 0, do_present = 0;
2414         syncops *sop = NULL;
2415         searchstate *ss;
2416         sync_control *srs;
2417         BerVarray ctxcsn;
2418         int i, *sids, numcsns;
2419         struct berval mincsn, maxcsn;
2420         int dirty = 0;
2421
2422         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2423
2424         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2425                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2426                 return rs->sr_err;
2427         }
2428
2429         srs = op->o_controls[slap_cids.sc_LDAPsync];
2430
2431         /* If this is a persistent search, set it up right away */
2432         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2433                 syncops so = {0};
2434                 fbase_cookie fc;
2435                 opcookie opc;
2436                 slap_callback sc;
2437
2438                 fc.fss = &so;
2439                 fc.fbase = 0;
2440                 so.s_eid = NOID;
2441                 so.s_op = op;
2442                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2443                 /* syncprov_findbase expects to be called as a callback... */
2444                 sc.sc_private = &opc;
2445                 opc.son = on;
2446                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2447                 cb = op->o_callback;
2448                 op->o_callback = &sc;
2449                 rs->sr_err = syncprov_findbase( op, &fc );
2450                 op->o_callback = cb;
2451                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2452
2453                 if ( rs->sr_err != LDAP_SUCCESS ) {
2454                         send_ldap_result( op, rs );
2455                         return rs->sr_err;
2456                 }
2457                 sop = ch_malloc( sizeof( syncops ));
2458                 *sop = so;
2459                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2460                 sop->s_rid = srs->sr_state.rid;
2461                 sop->s_sid = srs->sr_state.sid;
2462                 sop->s_inuse = 1;
2463
2464                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2465                 while ( si->si_active ) {
2466                         /* Wait for active mods to finish before proceeding, as they
2467                          * may already have inspected the si_ops list looking for
2468                          * consumers to replicate the change to.  Using the log
2469                          * doesn't help, as we may finish playing it before the
2470                          * active mods gets added to it.
2471                          */
2472                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2473                         if ( slapd_shutdown )
2474                                 return SLAPD_ABANDON;
2475                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2476                                 ldap_pvt_thread_yield();
2477                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2478                 }
2479                 sop->s_next = si->si_ops;
2480                 si->si_ops = sop;
2481                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2482         }
2483
2484         /* snapshot the ctxcsn */
2485         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2486         numcsns = si->si_numcsns;
2487         if ( numcsns ) {
2488                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2489                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2490                 for ( i=0; i<numcsns; i++ )
2491                         sids[i] = si->si_sids[i];
2492         } else {
2493                 ctxcsn = NULL;
2494                 sids = NULL;
2495         }
2496         dirty = si->si_dirty;
2497         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2498
2499         /* If we have a cookie, handle the PRESENT lookups */
2500         if ( srs->sr_state.ctxcsn ) {
2501                 sessionlog *sl;
2502                 int i, j;
2503
2504                 /* If we don't have any CSN of our own yet, pretend nothing
2505                  * has changed.
2506                  */
2507                 if ( !numcsns )
2508                         goto no_change;
2509
2510                 if ( !si->si_nopres )
2511                         do_present = SS_PRESENT;
2512
2513                 /* If there are SIDs we don't recognize in the cookie, drop them */
2514                 for (i=0; i<srs->sr_state.numcsns; ) {
2515                         for (j=0; j<numcsns; j++) {
2516                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2517                                         break;
2518                                 }
2519                         }
2520                         /* not found */
2521                         if ( j == numcsns ) {
2522                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2523                                 j = srs->sr_state.numcsns - 1;
2524                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2525                                 tmp.bv_len = 0;
2526                                 srs->sr_state.ctxcsn[j] = tmp;
2527                                 srs->sr_state.numcsns = j;
2528                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2529                                 continue;
2530                         }
2531                         i++;
2532                 }
2533
2534                 /* Find the smallest CSN which differs from contextCSN */
2535                 mincsn.bv_len = 0;
2536                 maxcsn.bv_len = 0;
2537                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2538                         for ( j=0; j<numcsns; j++ ) {
2539                                 if ( srs->sr_state.sids[i] != sids[j] )
2540                                         continue;
2541                                 if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2542                                         &srs->sr_state.ctxcsn[i] ) < 0 ) {
2543                                         maxcsn = srs->sr_state.ctxcsn[i];
2544                                 }
2545                                 if ( ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ) < 0) {
2546                                         if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2547                                                 &srs->sr_state.ctxcsn[i] ) > 0 ) {
2548                                                 mincsn = srs->sr_state.ctxcsn[i];
2549                                         }
2550                                 }
2551                         }
2552                 }
2553                 if ( BER_BVISEMPTY( &mincsn ))
2554                         mincsn = maxcsn;
2555
2556                 /* If nothing has changed, shortcut it */
2557                 if ( srs->sr_state.numcsns == numcsns ) {
2558                         int i, j, newer;
2559                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2560                                 for ( j=0; j<numcsns; j++ ) {
2561                                         if ( srs->sr_state.sids[i] != sids[j] )
2562                                                 continue;
2563                                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2564                                         /* If our state is newer, tell consumer about changes */
2565                                         if ( newer < 0 )
2566                                                 changed = SS_CHANGED;
2567                                         else if ( newer > 0 ) {
2568                                         /* our state is older, complain to consumer */
2569                                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2570                                                 rs->sr_text = "consumer state is newer than provider!";
2571 bailout:
2572                                                 if ( sop ) {
2573                                                         syncops **sp = &si->si_ops;
2574
2575                                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2576                                                         while ( *sp != sop )
2577                                                                 sp = &(*sp)->s_next;
2578                                                         *sp = sop->s_next;
2579                                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2580                                                         ch_free( sop );
2581                                                 }
2582                                                 rs->sr_ctrls = NULL;
2583                                                 send_ldap_result( op, rs );
2584                                                 return rs->sr_err;
2585                                         }
2586                                         break;
2587                                 }
2588                                 if ( changed )
2589                                         break;
2590                         }
2591                         if ( !changed && !dirty ) {
2592                                 do_present = 0;
2593 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2594                                         LDAPControl     *ctrls[2];
2595
2596                                         ctrls[0] = NULL;
2597                                         ctrls[1] = NULL;
2598                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2599                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2600                                         rs->sr_ctrls = ctrls;
2601                                         rs->sr_err = LDAP_SUCCESS;
2602                                         send_ldap_result( op, rs );
2603                                         rs->sr_ctrls = NULL;
2604                                         return rs->sr_err;
2605                                 }
2606                                 goto shortcut;
2607                         }
2608                 } else {
2609                         /* consumer doesn't have the right number of CSNs */
2610                         changed = SS_CHANGED;
2611                 }
2612                 /* Do we have a sessionlog for this search? */
2613                 sl=si->si_logs;
2614                 if ( sl ) {
2615                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2616                         /* Are there any log entries, and is the consumer state
2617                          * present in the session log?
2618                          */
2619                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2620                                 do_present = 0;
2621                                 /* mutex is unlocked in playlog */
2622                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2623                         } else {
2624                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2625                         }
2626                 }
2627                 /* Is the CSN still present in the database? */
2628                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2629                         /* No, so a reload is required */
2630                         /* the 2.2 consumer doesn't send this hint */
2631                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2632                                 if ( ctxcsn )
2633                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2634                                 if ( sids )
2635                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2636                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2637                                 rs->sr_text = "sync cookie is stale";
2638                                 goto bailout;
2639                         }
2640                         if ( srs->sr_state.ctxcsn ) {
2641                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2642                                 srs->sr_state.ctxcsn = NULL;
2643                         }
2644                         if ( srs->sr_state.sids ) {
2645                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2646                                 srs->sr_state.sids = NULL;
2647                         }
2648                         srs->sr_state.numcsns = 0;
2649                 } else {
2650                         gotstate = 1;
2651                         /* If changed and doing Present lookup, send Present UUIDs */
2652                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2653                                 LDAP_SUCCESS ) {
2654                                 if ( ctxcsn )
2655                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2656                                 if ( sids )
2657                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2658                                 goto bailout;
2659                         }
2660                 }
2661         } else {
2662                 /* No consumer state, assume something has changed */
2663                 changed = SS_CHANGED;
2664         }
2665
2666 shortcut:
2667         /* Append CSN range to search filter, save original filter
2668          * for persistent search evaluation
2669          */
2670         if ( sop ) {
2671                 sop->s_filterstr= op->ors_filterstr;
2672         }
2673
2674         /* If something changed, find the changes */
2675         if ( gotstate && ( changed || dirty ) ) {
2676                 Filter *fand, *fava;
2677
2678                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2679                 fand->f_choice = LDAP_FILTER_AND;
2680                 fand->f_next = NULL;
2681                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2682                 fand->f_and = fava;
2683                 fava->f_choice = LDAP_FILTER_GE;
2684                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2685                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2686 #ifdef LDAP_COMP_MATCH
2687                 fava->f_ava->aa_cf = NULL;
2688 #endif
2689                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2690                 fava->f_next = op->ors_filter;
2691                 if ( sop )
2692                         ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2693                 op->ors_filter = fand;
2694                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2695                 if ( sop ) {
2696                         sop->s_flags |= PS_FIX_FILTER;
2697                         ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2698                 }
2699         }
2700
2701         /* Let our callback add needed info to returned entries */
2702         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2703         ss = (searchstate *)(cb+1);
2704         ss->ss_on = on;
2705         ss->ss_so = sop;
2706         ss->ss_flags = do_present | changed;
2707         ss->ss_ctxcsn = ctxcsn;
2708         ss->ss_numcsns = numcsns;
2709         ss->ss_sids = sids;
2710         cb->sc_response = syncprov_search_response;
2711         cb->sc_cleanup = syncprov_search_cleanup;
2712         cb->sc_private = ss;
2713         cb->sc_next = op->o_callback;
2714         op->o_callback = cb;
2715
2716         /* If this is a persistent search and no changes were reported during
2717          * the refresh phase, just invoke the response callback to transition
2718          * us into persist phase
2719          */
2720         if ( !changed && !dirty ) {
2721                 rs->sr_err = LDAP_SUCCESS;
2722                 rs->sr_nentries = 0;
2723                 send_ldap_result( op, rs );
2724                 return rs->sr_err;
2725         }
2726         return SLAP_CB_CONTINUE;
2727 }
2728
2729 static int
2730 syncprov_operational(
2731         Operation *op,
2732         SlapReply *rs )
2733 {
2734         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2735         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2736
2737         /* This prevents generating unnecessarily; frontend will strip
2738          * any statically stored copy.
2739          */
2740         if ( op->o_sync != SLAP_CONTROL_NONE )
2741                 return SLAP_CB_CONTINUE;
2742
2743         if ( rs->sr_entry &&
2744                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2745
2746                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2747                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2748                         Attribute *a, **ap = NULL;
2749
2750                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2751                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2752                                         break;
2753                         }
2754
2755                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2756                         if ( si->si_ctxcsn ) {
2757                                 if ( !a ) {
2758                                         for ( ap = &rs->sr_operational_attrs; *ap;
2759                                                 ap=&(*ap)->a_next );
2760
2761                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2762                                         *ap = a;
2763                                 }
2764
2765                                 if ( !ap ) {
2766                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2767                                                 Entry *e = entry_dup( rs->sr_entry );
2768                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2769                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2770                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2771                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2772                                                         entry_free( rs->sr_entry );
2773                                                 }
2774                                                 rs->sr_entry = e;
2775                                                 rs->sr_flags |=
2776                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2777                                                 a = attr_find( rs->sr_entry->e_attrs,
2778                                                         slap_schema.si_ad_contextCSN );
2779                                         }
2780                                         if ( a->a_nvals != a->a_vals ) {
2781                                                 ber_bvarray_free( a->a_nvals );
2782                                         }
2783                                         a->a_nvals = NULL;
2784                                         ber_bvarray_free( a->a_vals );
2785                                         a->a_vals = NULL;
2786                                         a->a_numvals = 0;
2787                                 }
2788                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2789                         }
2790                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2791                 }
2792         }
2793         return SLAP_CB_CONTINUE;
2794 }
2795
2796 enum {
2797         SP_CHKPT = 1,
2798         SP_SESSL,
2799         SP_NOPRES,
2800         SP_USEHINT
2801 };
2802
2803 static ConfigDriver sp_cf_gen;
2804
2805 static ConfigTable spcfg[] = {
2806         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2807                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2808                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2809                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2810         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2811                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2812                         "DESC 'Session log size in ops' "
2813                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2814         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2815                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2816                         "DESC 'Omit Present phase processing' "
2817                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2818         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2819                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2820                         "DESC 'Observe Reload Hint in Request control' "
2821                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2822         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2823 };
2824
2825 static ConfigOCs spocs[] = {
2826         { "( OLcfgOvOc:1.1 "
2827                 "NAME 'olcSyncProvConfig' "
2828                 "DESC 'SyncRepl Provider configuration' "
2829                 "SUP olcOverlayConfig "
2830                 "MAY ( olcSpCheckpoint "
2831                         "$ olcSpSessionlog "
2832                         "$ olcSpNoPresent "
2833                         "$ olcSpReloadHint "
2834                 ") )",
2835                         Cft_Overlay, spcfg },
2836         { NULL, 0, NULL }
2837 };
2838
2839 static int
2840 sp_cf_gen(ConfigArgs *c)
2841 {
2842         slap_overinst           *on = (slap_overinst *)c->bi;
2843         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2844         int rc = 0;
2845
2846         if ( c->op == SLAP_CONFIG_EMIT ) {
2847                 switch ( c->type ) {
2848                 case SP_CHKPT:
2849                         if ( si->si_chkops || si->si_chktime ) {
2850                                 struct berval bv;
2851                                 /* we assume si_chktime is a multiple of 60
2852                                  * because the parsed value was originally
2853                                  * multiplied by 60 */
2854                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2855                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2856                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2857                                         rc = 1;
2858                                 } else {
2859                                         bv.bv_val = c->cr_msg;
2860                                         value_add_one( &c->rvalue_vals, &bv );
2861                                 }
2862                         } else {
2863                                 rc = 1;
2864                         }
2865                         break;
2866                 case SP_SESSL:
2867                         if ( si->si_logs ) {
2868                                 c->value_int = si->si_logs->sl_size;
2869                         } else {
2870                                 rc = 1;
2871                         }
2872                         break;
2873                 case SP_NOPRES:
2874                         if ( si->si_nopres ) {
2875                                 c->value_int = 1;
2876                         } else {
2877                                 rc = 1;
2878                         }
2879                         break;
2880                 case SP_USEHINT:
2881                         if ( si->si_usehint ) {
2882                                 c->value_int = 1;
2883                         } else {
2884                                 rc = 1;
2885                         }
2886                         break;
2887                 }
2888                 return rc;
2889         } else if ( c->op == LDAP_MOD_DELETE ) {
2890                 switch ( c->type ) {
2891                 case SP_CHKPT:
2892                         si->si_chkops = 0;
2893                         si->si_chktime = 0;
2894                         break;
2895                 case SP_SESSL:
2896                         if ( si->si_logs )
2897                                 si->si_logs->sl_size = 0;
2898                         else
2899                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2900                         break;
2901                 case SP_NOPRES:
2902                         if ( si->si_nopres )
2903                                 si->si_nopres = 0;
2904                         else
2905                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2906                         break;
2907                 case SP_USEHINT:
2908                         if ( si->si_usehint )
2909                                 si->si_usehint = 0;
2910                         else
2911                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2912                         break;
2913                 }
2914                 return rc;
2915         }
2916         switch ( c->type ) {
2917         case SP_CHKPT:
2918                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2919                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2920                                 c->argv[0], c->argv[1] );
2921                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2922                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2923                         return ARG_BAD_CONF;
2924                 }
2925                 if ( si->si_chkops <= 0 ) {
2926                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2927                                 c->argv[0], si->si_chkops );
2928                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2929                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2930                         return ARG_BAD_CONF;
2931                 }
2932                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2933                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2934                                 c->argv[0], c->argv[1] );
2935                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2936                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2937                         return ARG_BAD_CONF;
2938                 }
2939                 if ( si->si_chktime <= 0 ) {
2940                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2941                                 c->argv[0], si->si_chkops );
2942                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2943                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2944                         return ARG_BAD_CONF;
2945                 }
2946                 si->si_chktime *= 60;
2947                 break;
2948         case SP_SESSL: {
2949                 sessionlog *sl;
2950                 int size = c->value_int;
2951
2952                 if ( size < 0 ) {
2953                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2954                                 c->argv[0], size );
2955                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2956                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2957                         return ARG_BAD_CONF;
2958                 }
2959                 sl = si->si_logs;
2960                 if ( !sl ) {
2961                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_PVT_CSNSTR_BUFSIZE );
2962                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2963                         sl->sl_mincsn.bv_len = 0;
2964                         sl->sl_num = 0;
2965                         sl->sl_head = sl->sl_tail = NULL;
2966                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2967                         si->si_logs = sl;
2968                 }
2969                 sl->sl_size = size;
2970                 }
2971                 break;
2972         case SP_NOPRES:
2973                 si->si_nopres = c->value_int;
2974                 break;
2975         case SP_USEHINT:
2976                 si->si_usehint = c->value_int;
2977                 break;
2978         }
2979         return rc;
2980 }
2981
2982 /* ITS#3456 we cannot run this search on the main thread, must use a
2983  * child thread in order to insure we have a big enough stack.
2984  */
2985 static void *
2986 syncprov_db_otask(
2987         void *ptr
2988 )
2989 {
2990         syncprov_findcsn( ptr, FIND_MAXCSN );
2991         return NULL;
2992 }
2993
2994 /* Read any existing contextCSN from the underlying db.
2995  * Then search for any entries newer than that. If no value exists,
2996  * just generate it. Cache whatever result.
2997  */
2998 static int
2999 syncprov_db_open(
3000         BackendDB *be,
3001         ConfigReply *cr
3002 )
3003 {
3004         slap_overinst   *on = (slap_overinst *) be->bd_info;
3005         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3006
3007         Connection conn = { 0 };
3008         OperationBuffer opbuf;
3009         Operation *op;
3010         Entry *e = NULL;
3011         Attribute *a;
3012         int rc;
3013         void *thrctx = NULL;
3014
3015         if ( !SLAP_LASTMOD( be )) {
3016                 Debug( LDAP_DEBUG_ANY,
3017                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3018                 return -1;
3019         }
3020
3021         if ( slapMode & SLAP_TOOL_MODE ) {
3022                 return 0;
3023         }
3024
3025         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3026         if ( rc ) {
3027                 return rc;
3028         }
3029
3030         thrctx = ldap_pvt_thread_pool_context();
3031         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3032         op = &opbuf.ob_op;
3033         op->o_bd = be;
3034         op->o_dn = be->be_rootdn;
3035         op->o_ndn = be->be_rootndn;
3036
3037         if ( SLAP_SYNC_SUBENTRY( be )) {
3038                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3039                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3040         } else {
3041                 si->si_contextdn = be->be_nsuffix[0];
3042         }
3043         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3044                 slap_schema.si_ad_contextCSN, 0, &e, on );
3045
3046         if ( e ) {
3047                 ldap_pvt_thread_t tid;
3048
3049                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3050                 if ( a ) {
3051                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3052                         si->si_numcsns = a->a_numvals;
3053                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3054                 }
3055                 overlay_entry_release_ov( op, e, 0, on );
3056                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3057                         op->o_req_dn = be->be_suffix[0];
3058                         op->o_req_ndn = be->be_nsuffix[0];
3059                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3060                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3061                         ldap_pvt_thread_join( tid, NULL );
3062                 }
3063         }
3064
3065         /* Didn't find a contextCSN, should we generate one? */
3066         if ( !si->si_ctxcsn ) {
3067                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3068                 struct berval csn;
3069
3070                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
3071                 /* If we're also a consumer, then don't generate anything.
3072                  * Wait for our provider to send it to us, or for a local
3073                  * modify if we have multimaster.
3074                  */
3075                         goto out;
3076                 }
3077                 csn.bv_val = csnbuf;
3078                 csn.bv_len = sizeof( csnbuf );
3079                 slap_get_csn( op, &csn, 0 );
3080                 value_add_one( &si->si_ctxcsn, &csn );
3081                 si->si_numcsns = 1;
3082                 si->si_sids = ch_malloc( sizeof(int) );
3083                 si->si_sids[0] = slap_serverID;
3084
3085                 /* make sure we do a checkpoint on close */
3086                 si->si_numops++;
3087         }
3088
3089         /* Initialize the sessionlog mincsn */
3090         if ( si->si_logs && si->si_numcsns ) {
3091                 sessionlog *sl = si->si_logs;
3092                 int i;
3093                 /* If there are multiple, find the newest */
3094                 for ( i=0; i < si->si_numcsns; i++ ) {
3095                         if ( ber_bvcmp( &sl->sl_mincsn, &si->si_ctxcsn[i] ) < 0 ) {
3096                                 AC_MEMCPY( sl->sl_mincsn.bv_val, si->si_ctxcsn[i].bv_val,
3097                                         si->si_ctxcsn[i].bv_len );
3098                                 sl->sl_mincsn.bv_len = si->si_ctxcsn[i].bv_len;
3099                         }
3100                 }
3101         }
3102
3103 out:
3104         op->o_bd->bd_info = (BackendInfo *)on;
3105         return 0;
3106 }
3107
3108 /* Write the current contextCSN into the underlying db.
3109  */
3110 static int
3111 syncprov_db_close(
3112         BackendDB *be,
3113         ConfigReply *cr
3114 )
3115 {
3116     slap_overinst   *on = (slap_overinst *) be->bd_info;
3117     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3118
3119         if ( slapMode & SLAP_TOOL_MODE ) {
3120                 return 0;
3121         }
3122         if ( si->si_numops ) {
3123                 Connection conn = {0};
3124                 OperationBuffer opbuf;
3125                 Operation *op;
3126                 SlapReply rs = {REP_RESULT};
3127                 void *thrctx;
3128
3129                 thrctx = ldap_pvt_thread_pool_context();
3130                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3131                 op = &opbuf.ob_op;
3132                 op->o_bd = be;
3133                 op->o_dn = be->be_rootdn;
3134                 op->o_ndn = be->be_rootndn;
3135                 syncprov_checkpoint( op, &rs, on );
3136         }
3137
3138     return 0;
3139 }
3140
3141 static int
3142 syncprov_db_init(
3143         BackendDB *be,
3144         ConfigReply *cr
3145 )
3146 {
3147         slap_overinst   *on = (slap_overinst *)be->bd_info;
3148         syncprov_info_t *si;
3149
3150         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3151                 Debug( LDAP_DEBUG_ANY,
3152                         "syncprov must be instantiated within a database.\n",
3153                         0, 0, 0 );
3154                 return 1;
3155         }
3156
3157         si = ch_calloc(1, sizeof(syncprov_info_t));
3158         on->on_bi.bi_private = si;
3159         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3160         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3161         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3162         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3163
3164         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3165         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3166         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3167         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3168
3169         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3170         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3171
3172         return 0;
3173 }
3174
3175 static int
3176 syncprov_db_destroy(
3177         BackendDB *be,
3178         ConfigReply *cr
3179 )
3180 {
3181         slap_overinst   *on = (slap_overinst *)be->bd_info;
3182         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3183
3184         if ( si ) {
3185                 if ( si->si_logs ) {
3186                         slog_entry *se = si->si_logs->sl_head;
3187
3188                         while ( se ) {
3189                                 slog_entry *se_next = se->se_next;
3190                                 ch_free( se );
3191                                 se = se_next;
3192                         }
3193
3194                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3195                         ch_free( si->si_logs );
3196                 }
3197                 if ( si->si_ctxcsn )
3198                         ber_bvarray_free( si->si_ctxcsn );
3199                 if ( si->si_sids )
3200                         ch_free( si->si_sids );
3201                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3202                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3203                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3204                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3205                 ch_free( si );
3206         }
3207
3208         return 0;
3209 }
3210
3211 static int syncprov_parseCtrl (
3212         Operation *op,
3213         SlapReply *rs,
3214         LDAPControl *ctrl )
3215 {
3216         ber_tag_t tag;
3217         BerElementBuffer berbuf;
3218         BerElement *ber = (BerElement *)&berbuf;
3219         ber_int_t mode;
3220         ber_len_t len;
3221         struct berval cookie = BER_BVNULL;
3222         sync_control *sr;
3223         int rhint = 0;
3224
3225         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3226                 rs->sr_text = "Sync control specified multiple times";
3227                 return LDAP_PROTOCOL_ERROR;
3228         }
3229
3230         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3231                 rs->sr_text = "Sync control specified with pagedResults control";
3232                 return LDAP_PROTOCOL_ERROR;
3233         }
3234
3235         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3236                 rs->sr_text = "Sync control value is absent";
3237                 return LDAP_PROTOCOL_ERROR;
3238         }
3239
3240         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3241                 rs->sr_text = "Sync control value is empty";
3242                 return LDAP_PROTOCOL_ERROR;
3243         }
3244
3245         /* Parse the control value
3246          *      syncRequestValue ::= SEQUENCE {
3247          *              mode   ENUMERATED {
3248          *                      -- 0 unused
3249          *                      refreshOnly             (1),
3250          *                      -- 2 reserved
3251          *                      refreshAndPersist       (3)
3252          *              },
3253          *              cookie  syncCookie OPTIONAL
3254          *      }
3255          */
3256
3257         ber_init2( ber, &ctrl->ldctl_value, 0 );
3258
3259         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3260                 rs->sr_text = "Sync control : mode decoding error";
3261                 return LDAP_PROTOCOL_ERROR;
3262         }
3263
3264         switch( mode ) {
3265         case LDAP_SYNC_REFRESH_ONLY:
3266                 mode = SLAP_SYNC_REFRESH;
3267                 break;
3268         case LDAP_SYNC_REFRESH_AND_PERSIST:
3269                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3270                 break;
3271         default:
3272                 rs->sr_text = "Sync control : unknown update mode";
3273                 return LDAP_PROTOCOL_ERROR;
3274         }
3275
3276         tag = ber_peek_tag( ber, &len );
3277
3278         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3279                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3280                         rs->sr_text = "Sync control : cookie decoding error";
3281                         return LDAP_PROTOCOL_ERROR;
3282                 }
3283                 tag = ber_peek_tag( ber, &len );
3284         }
3285         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3286                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3287                         rs->sr_text = "Sync control : rhint decoding error";
3288                         return LDAP_PROTOCOL_ERROR;
3289                 }
3290         }
3291         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3292                         rs->sr_text = "Sync control : decoding error";
3293                         return LDAP_PROTOCOL_ERROR;
3294         }
3295         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3296         sr->sr_rhint = rhint;
3297         if (!BER_BVISNULL(&cookie)) {
3298                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3299                 /* If parse fails, pretend no cookie was sent */
3300                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3301                         sr->sr_state.rid == -1 ) {
3302                         if ( sr->sr_state.ctxcsn ) {
3303                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3304                                 sr->sr_state.ctxcsn = NULL;
3305                         }
3306                         sr->sr_state.numcsns = 0;
3307                 }
3308         }
3309
3310         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3311
3312         op->o_sync = ctrl->ldctl_iscritical
3313                 ? SLAP_CONTROL_CRITICAL
3314                 : SLAP_CONTROL_NONCRITICAL;
3315
3316         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3317
3318         return LDAP_SUCCESS;
3319 }
3320
3321 /* This overlay is set up for dynamic loading via moduleload. For static
3322  * configuration, you'll need to arrange for the slap_overinst to be
3323  * initialized and registered by some other function inside slapd.
3324  */
3325
3326 static slap_overinst            syncprov;
3327
3328 int
3329 syncprov_initialize()
3330 {
3331         int rc;
3332
3333         rc = register_supported_control( LDAP_CONTROL_SYNC,
3334                 SLAP_CTRL_SEARCH, NULL,
3335                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3336         if ( rc != LDAP_SUCCESS ) {
3337                 Debug( LDAP_DEBUG_ANY,
3338                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3339                 return rc;
3340         }
3341
3342         syncprov.on_bi.bi_type = "syncprov";
3343         syncprov.on_bi.bi_db_init = syncprov_db_init;
3344         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3345         syncprov.on_bi.bi_db_open = syncprov_db_open;
3346         syncprov.on_bi.bi_db_close = syncprov_db_close;
3347
3348         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3349         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3350
3351         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3352         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3353         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3354         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3355         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3356         syncprov.on_bi.bi_op_search = syncprov_op_search;
3357         syncprov.on_bi.bi_extended = syncprov_op_extended;
3358         syncprov.on_bi.bi_operational = syncprov_operational;
3359
3360         syncprov.on_bi.bi_cf_ocs = spocs;
3361
3362         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3363
3364         rc = config_register_schema( spcfg, spocs );
3365         if ( rc ) return rc;
3366
3367         return overlay_register( &syncprov );
3368 }
3369
3370 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3371 int
3372 init_module( int argc, char *argv[] )
3373 {
3374         return syncprov_initialize();
3375 }
3376 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3377
3378 #endif /* defined(SLAPD_OVER_SYNCPROV) */