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