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 2004-2008 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 /* A modify request on a particular entry */
  32 typedef struct modinst {
  33         struct modinst *mi_next;
  34         Operation *mi_op;
  35 } modinst;
  36
  37 typedef struct modtarget {
  38         struct modinst *mt_mods;
  39         struct modinst *mt_tail;
  40         Operation *mt_op;
  41         ldap_pvt_thread_mutex_t mt_mutex;
  42 } modtarget;
  43
  44 /* A queued result of a persistent search */
  45 typedef struct syncres {
  46         struct syncres *s_next;
  47         struct berval s_dn;
  48         struct berval s_ndn;
  49         struct berval s_uuid;
  50         struct berval s_csn;
  51         char s_mode;
  52         char s_isreference;
  53 } syncres;
  54
  55 /* Record of a persistent search */
  56 typedef struct syncops {
  57         struct syncops *s_next;
  58         struct berval   s_base;         /* ndn of search base */
  59         ID              s_eid;          /* entryID of search base */
  60         Operation       *s_op;          /* search op */
  61         int             s_rid;
  62         int             s_sid;
  63         struct berval s_filterstr;
  64         int             s_flags;        /* search status */
  65 #define PS_IS_REFRESHING        0x01
  66 #define PS_IS_DETACHED          0x02
  67 #define PS_WROTE_BASE           0x04
  68 #define PS_FIND_BASE            0x08
  69 #define PS_FIX_FILTER           0x10
  70
  71         int             s_inuse;        /* reference count */
  72         struct syncres *s_res;
  73         struct syncres *s_restail;
  74         struct re_s     *s_qtask;       /* task for playing psearch responses */
  75 #define RUNQ_INTERVAL   36000   /* a long time */
  76         ldap_pvt_thread_mutex_t s_mutex;
  77 } syncops;
  78
  79 /* A received sync control */
  80 typedef struct sync_control {
  81         struct sync_cookie sr_state;
  82         int sr_rhint;
  83 } sync_control;
  84
  85 #if 0 /* moved back to slap.h */
  86 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  87 #endif
  88 /* o_sync_mode uses data bits of o_sync */
  89 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  90
  91 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  93 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  94 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  95
  96 /* Record of which searches matched at premodify step */
  97 typedef struct syncmatches {
  98         struct syncmatches *sm_next;
  99         syncops *sm_op;
 100 } syncmatches;
 101
 102 /* Session log data */
 103 typedef struct slog_entry {
 104         struct slog_entry *se_next;
 105         struct berval se_uuid;
 106         struct berval se_csn;
 107         int     se_sid;
 108         ber_tag_t       se_tag;
 109 } slog_entry;
 110
 111 typedef struct sessionlog {
 112         struct berval   sl_mincsn;
 113         int             sl_num;
 114         int             sl_size;
 115         slog_entry *sl_head;
 116         slog_entry *sl_tail;
 117         ldap_pvt_thread_mutex_t sl_mutex;
 118 } sessionlog;
 119
 120 /* The main state for this overlay */
 121 typedef struct syncprov_info_t {
 122         syncops         *si_ops;
 123         BerVarray       si_ctxcsn;      /* ldapsync context */
 124         int             *si_sids;
 125         int             si_numcsns;
 126         int             si_chkops;      /* checkpointing info */
 127         int             si_chktime;
 128         int             si_numops;      /* number of ops since last checkpoint */
 129         int             si_nopres;      /* Skip present phase */
 130         int             si_usehint;     /* use reload hint */
 131         time_t  si_chklast;     /* time of last checkpoint */
 132         Avlnode *si_mods;       /* entries being modified */
 133         sessionlog      *si_logs;
 134         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 135         ldap_pvt_thread_mutex_t si_ops_mutex;
 136         ldap_pvt_thread_mutex_t si_mods_mutex;
 137 } syncprov_info_t;
 138
 139 typedef struct opcookie {
 140         slap_overinst *son;
 141         syncmatches *smatches;
 142         struct berval sdn;      /* DN of entry, for deletes */
 143         struct berval sndn;
 144         struct berval suuid;    /* UUID of entry */
 145         struct berval sctxcsn;
 146         int sreference; /* Is the entry a reference? */
 147 } opcookie;
 148
 149 typedef struct fbase_cookie {
 150         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 151         syncops *fss;   /* persistent search we're testing against */
 152         int fbase;      /* if TRUE we found the search base and it's still valid */
 153         int fscope;     /* if TRUE then fdn is within the psearch scope */
 154 } fbase_cookie;
 155
 156 static AttributeName csn_anlist[3];
 157 static AttributeName uuid_anlist[2];
 158
 159 /* Build a LDAPsync intermediate state control */
 160 static int
 161 syncprov_state_ctrl(
 162         Operation       *op,
 163         SlapReply       *rs,
 164         Entry           *e,
 165         int             entry_sync_state,
 166         LDAPControl     **ctrls,
 167         int             num_ctrls,
 168         int             send_cookie,
 169         struct berval   *cookie )
 170 {
 171         Attribute* a;
 172         int ret;
 173
 174         BerElementBuffer berbuf;
 175         BerElement *ber = (BerElement *)&berbuf;
 176
 177         struct berval   entryuuid_bv = BER_BVNULL;
 178
 179         ber_init2( ber, 0, LBER_USE_DER );
 180         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 181
 182         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 183
 184         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 185                 AttributeDescription *desc = a->a_desc;
 186                 if ( desc == slap_schema.si_ad_entryUUID ) {
 187                         entryuuid_bv = a->a_nvals[0];
 188                         break;
 189                 }
 190         }
 191
 192         /* FIXME: what if entryuuid is NULL or empty ? */
 193
 194         if ( send_cookie && cookie ) {
 195                 ber_printf( ber, "{eOON}",
 196                         entry_sync_state, &entryuuid_bv, cookie );
 197         } else {
 198                 ber_printf( ber, "{eON}",
 199                         entry_sync_state, &entryuuid_bv );
 200         }
 201
 202         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 203         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 204         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 205
 206         ber_free_buf( ber );
 207
 208         if ( ret < 0 ) {
 209                 Debug( LDAP_DEBUG_TRACE,
 210                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 211                         0, 0, 0 );
 212                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 213                 return ret;
 214         }
 215
 216         return LDAP_SUCCESS;
 217 }
 218
 219 /* Build a LDAPsync final state control */
 220 static int
 221 syncprov_done_ctrl(
 222         Operation       *op,
 223         SlapReply       *rs,
 224         LDAPControl     **ctrls,
 225         int                     num_ctrls,
 226         int                     send_cookie,
 227         struct berval *cookie,
 228         int                     refreshDeletes )
 229 {
 230         int ret;
 231         BerElementBuffer berbuf;
 232         BerElement *ber = (BerElement *)&berbuf;
 233
 234         ber_init2( ber, NULL, LBER_USE_DER );
 235         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 236
 237         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 238
 239         ber_printf( ber, "{" );
 240         if ( send_cookie && cookie ) {
 241                 ber_printf( ber, "O", cookie );
 242         }
 243         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 244                 ber_printf( ber, "b", refreshDeletes );
 245         }
 246         ber_printf( ber, "N}" );
 247
 248         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 249         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 250         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 251
 252         ber_free_buf( ber );
 253
 254         if ( ret < 0 ) {
 255                 Debug( LDAP_DEBUG_TRACE,
 256                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 257                         0, 0, 0 );
 258                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 259                 return ret;
 260         }
 261
 262         return LDAP_SUCCESS;
 263 }
 264
 265 static int
 266 syncprov_sendinfo(
 267         Operation       *op,
 268         SlapReply       *rs,
 269         int                     type,
 270         struct berval *cookie,
 271         int                     refreshDone,
 272         BerVarray       syncUUIDs,
 273         int                     refreshDeletes )
 274 {
 275         BerElementBuffer berbuf;
 276         BerElement *ber = (BerElement *)&berbuf;
 277         struct berval rspdata;
 278
 279         int ret;
 280
 281         ber_init2( ber, NULL, LBER_USE_DER );
 282         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 283
 284         if ( type ) {
 285                 switch ( type ) {
 286                 case LDAP_TAG_SYNC_NEW_COOKIE:
 287                         ber_printf( ber, "tO", type, cookie );
 288                         break;
 289                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 290                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 291                         ber_printf( ber, "t{", type );
 292                         if ( cookie ) {
 293                                 ber_printf( ber, "O", cookie );
 294                         }
 295                         if ( refreshDone == 0 ) {
 296                                 ber_printf( ber, "b", refreshDone );
 297                         }
 298                         ber_printf( ber, "N}" );
 299                         break;
 300                 case LDAP_TAG_SYNC_ID_SET:
 301                         ber_printf( ber, "t{", type );
 302                         if ( cookie ) {
 303                                 ber_printf( ber, "O", cookie );
 304                         }
 305                         if ( refreshDeletes == 1 ) {
 306                                 ber_printf( ber, "b", refreshDeletes );
 307                         }
 308                         ber_printf( ber, "[W]", syncUUIDs );
 309                         ber_printf( ber, "N}" );
 310                         break;
 311                 default:
 312                         Debug( LDAP_DEBUG_TRACE,
 313                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 314                                 type, 0, 0 );
 315                         return LDAP_OTHER;
 316                 }
 317         }
 318
 319         ret = ber_flatten2( ber, &rspdata, 0 );
 320
 321         if ( ret < 0 ) {
 322                 Debug( LDAP_DEBUG_TRACE,
 323                         "syncprov_sendinfo: ber_flatten2 failed\n",
 324                         0, 0, 0 );
 325                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 326                 return ret;
 327         }
 328
 329         rs->sr_rspoid = LDAP_SYNC_INFO;
 330         rs->sr_rspdata = &rspdata;
 331         send_ldap_intermediate( op, rs );
 332         rs->sr_rspdata = NULL;
 333         ber_free_buf( ber );
 334
 335         return LDAP_SUCCESS;
 336 }
 337
 338 /* Find a modtarget in an AVL tree */
 339 static int
 340 sp_avl_cmp( const void *c1, const void *c2 )
 341 {
 342         const modtarget *m1, *m2;
 343         int rc;
 344
 345         m1 = c1; m2 = c2;
 346         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 347
 348         if ( rc ) return rc;
 349         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 350 }
 351
 352 /* syncprov_findbase:
 353  *   finds the true DN of the base of a search (with alias dereferencing) and
 354  * checks to make sure the base entry doesn't get replaced with a different
 355  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 356  * change is detected, any persistent search on this base must be terminated /
 357  * reloaded.
 358  *   On the first call, we just save the DN and entryID. On subsequent calls
 359  * we compare the DN and entryID with the saved values.
 360  */
 361 static int
 362 findbase_cb( Operation *op, SlapReply *rs )
 363 {
 364         slap_callback *sc = op->o_callback;
 365
 366         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 367                 fbase_cookie *fc = sc->sc_private;
 368
 369                 /* If no entryID, we're looking for the first time.
 370                  * Just store whatever we got.
 371                  */
 372                 if ( fc->fss->s_eid == NOID ) {
 373                         fc->fbase = 2;
 374                         fc->fss->s_eid = rs->sr_entry->e_id;
 375                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 376
 377                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 378                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 379
 380                 /* OK, the DN is the same and the entryID is the same. */
 381                         fc->fbase = 1;
 382                 }
 383         }
 384         if ( rs->sr_err != LDAP_SUCCESS ) {
 385                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 386         }
 387         return LDAP_SUCCESS;
 388 }
 389
 390 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 391 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 392
 393 static int
 394 syncprov_findbase( Operation *op, fbase_cookie *fc )
 395 {
 396         opcookie *opc = op->o_callback->sc_private;
 397         slap_overinst *on = opc->son;
 398
 399         /* Use basic parameters from syncrepl search, but use
 400          * current op's threadctx / tmpmemctx
 401          */
 402         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 403         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 404                 slap_callback cb = {0};
 405                 Operation fop;
 406                 SlapReply frs = { REP_RESULT };
 407                 BackendInfo *bi;
 408                 int rc;
 409
 410                 fc->fss->s_flags ^= PS_FIND_BASE;
 411                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 412
 413                 fop = *fc->fss->s_op;
 414
 415                 fop.o_hdr = op->o_hdr;
 416                 fop.o_bd = op->o_bd;
 417                 fop.o_time = op->o_time;
 418                 fop.o_tincr = op->o_tincr;
 419                 bi = op->o_bd->bd_info;
 420
 421                 cb.sc_response = findbase_cb;
 422                 cb.sc_private = fc;
 423
 424                 fop.o_sync_mode = 0;    /* turn off sync mode */
 425                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 426                 fop.o_callback = &cb;
 427                 fop.o_tag = LDAP_REQ_SEARCH;
 428                 fop.ors_scope = LDAP_SCOPE_BASE;
 429                 fop.ors_limit = NULL;
 430                 fop.ors_slimit = 1;
 431                 fop.ors_tlimit = SLAP_NO_LIMIT;
 432                 fop.ors_attrs = slap_anlist_no_attrs;
 433                 fop.ors_attrsonly = 1;
 434                 fop.ors_filter = &generic_filter;
 435                 fop.ors_filterstr = generic_filterstr;
 436
 437                 rc = overlay_op_walk( &fop, &frs, op_search, on->on_info, on );
 438                 op->o_bd->bd_info = bi;
 439         } else {
 440                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 441                 fc->fbase = 1;
 442         }
 443
 444         /* After the first call, see if the fdn resides in the scope */
 445         if ( fc->fbase == 1 ) {
 446                 switch ( fc->fss->s_op->ors_scope ) {
 447                 case LDAP_SCOPE_BASE:
 448                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 449                         break;
 450                 case LDAP_SCOPE_ONELEVEL: {
 451                         struct berval pdn;
 452                         dnParent( fc->fdn, &pdn );
 453                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 454                         break; }
 455                 case LDAP_SCOPE_SUBTREE:
 456                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 457                         break;
 458                 case LDAP_SCOPE_SUBORDINATE:
 459                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 460                                 !dn_match( fc->fdn, &fc->fss->s_base );
 461                         break;
 462                 }
 463         }
 464
 465         if ( fc->fbase )
 466                 return LDAP_SUCCESS;
 467
 468         /* If entryID has changed, then the base of this search has
 469          * changed. Invalidate the psearch.
 470          */
 471         return LDAP_NO_SUCH_OBJECT;
 472 }
 473
 474 /* syncprov_findcsn:
 475  *   This function has three different purposes, but they all use a search
 476  * that filters on entryCSN so they're combined here.
 477  * 1: at startup time, after a contextCSN has been read from the database,
 478  * we search for all entries with CSN >= contextCSN in case the contextCSN
 479  * was not checkpointed at the previous shutdown.
 480  *
 481  * 2: when the current contextCSN is known and we have a sync cookie, we search
 482  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 483  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 484  *
 485  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 486  * CSN, and generate Present records for them. We always collect this result
 487  * in SyncID sets, even if there's only one match.
 488  */
 489 typedef enum find_csn_t {
 490         FIND_MAXCSN     = 1,
 491         FIND_CSN        = 2,
 492         FIND_PRESENT    = 3
 493 } find_csn_t;
 494
 495 static int
 496 findmax_cb( Operation *op, SlapReply *rs )
 497 {
 498         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 499                 struct berval *maxcsn = op->o_callback->sc_private;
 500                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 501                         slap_schema.si_ad_entryCSN );
 502
 503                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 504                         maxcsn->bv_len = a->a_vals[0].bv_len;
 505                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 506                 }
 507         }
 508         return LDAP_SUCCESS;
 509 }
 510
 511 static int
 512 findcsn_cb( Operation *op, SlapReply *rs )
 513 {
 514         slap_callback *sc = op->o_callback;
 515
 516         /* We just want to know that at least one exists, so it's OK if
 517          * we exceed the unchecked limit.
 518          */
 519         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 520                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 521                 sc->sc_private = (void *)1;
 522         }
 523         return LDAP_SUCCESS;
 524 }
 525
 526 /* Build a list of entryUUIDs for sending in a SyncID set */
 527
 528 #define UUID_LEN        16
 529
 530 typedef struct fpres_cookie {
 531         int num;
 532         BerVarray uuids;
 533         char *last;
 534 } fpres_cookie;
 535
 536 static int
 537 findpres_cb( Operation *op, SlapReply *rs )
 538 {
 539         slap_callback *sc = op->o_callback;
 540         fpres_cookie *pc = sc->sc_private;
 541         Attribute *a;
 542         int ret = SLAP_CB_CONTINUE;
 543
 544         switch ( rs->sr_type ) {
 545         case REP_SEARCH:
 546                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 547                 if ( a ) {
 548                         pc->uuids[pc->num].bv_val = pc->last;
 549                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 550                                 pc->uuids[pc->num].bv_len );
 551                         pc->num++;
 552                         pc->last = pc->uuids[pc->num].bv_val;
 553                         pc->uuids[pc->num].bv_val = NULL;
 554                 }
 555                 ret = LDAP_SUCCESS;
 556                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 557                         break;
 558                 /* FALLTHRU */
 559         case REP_RESULT:
 560                 ret = rs->sr_err;
 561                 if ( pc->num ) {
 562                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 563                                 0, pc->uuids, 0 );
 564                         pc->uuids[pc->num].bv_val = pc->last;
 565                         pc->num = 0;
 566                         pc->last = pc->uuids[0].bv_val;
 567                 }
 568                 break;
 569         default:
 570                 break;
 571         }
 572         return ret;
 573 }
 574
 575 static int
 576 syncprov_findcsn( Operation *op, find_csn_t mode )
 577 {
 578         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 579         syncprov_info_t         *si = on->on_bi.bi_private;
 580
 581         slap_callback cb = {0};
 582         Operation fop;
 583         SlapReply frs = { REP_RESULT };
 584         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 585         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 586         struct berval maxcsn;
 587         Filter cf;
 588         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 589         fpres_cookie pcookie;
 590         sync_control *srs = NULL;
 591         struct slap_limits_set fc_limits;
 592         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 593         int maxid = 0;
 594
 595         if ( mode != FIND_MAXCSN ) {
 596                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 597         }
 598
 599         fop = *op;
 600         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 601         /* We want pure entries, not referrals */
 602         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 603
 604         cf.f_ava = &eq;
 605         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 606         BER_BVZERO( &cf.f_av_value );
 607         cf.f_next = NULL;
 608
 609         fop.o_callback = &cb;
 610         fop.ors_limit = NULL;
 611         fop.ors_tlimit = SLAP_NO_LIMIT;
 612         fop.ors_filter = &cf;
 613         fop.ors_filterstr.bv_val = buf;
 614
 615 again:
 616         switch( mode ) {
 617         case FIND_MAXCSN:
 618                 cf.f_choice = LDAP_FILTER_GE;
 619                 cf.f_av_value = si->si_ctxcsn[0];
 620                 /* If there are multiple CSNs, use the largest */
 621                 for ( i=1; i<si->si_numcsns; i++) {
 622                         if ( ber_bvcmp( &cf.f_av_value, &si->si_ctxcsn[i] ) < 0 ) {
 623                                 cf.f_av_value = si->si_ctxcsn[i];
 624                                 maxid = i;
 625                         }
 626                 }
 627                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 628                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 629                 if ( fop.ors_filterstr.bv_len < 0 || fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 630                         return LDAP_OTHER;
 631                 }
 632                 fop.ors_attrsonly = 0;
 633                 fop.ors_attrs = csn_anlist;
 634                 fop.ors_slimit = SLAP_NO_LIMIT;
 635                 cb.sc_private = &maxcsn;
 636                 cb.sc_response = findmax_cb;
 637                 strcpy( cbuf, cf.f_av_value.bv_val );
 638                 maxcsn.bv_val = cbuf;
 639                 maxcsn.bv_len = cf.f_av_value.bv_len;
 640                 break;
 641         case FIND_CSN:
 642                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 643                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 644                         /* If there are multiple CSNs, use the smallest */
 645                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 646                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 647                                         > 0 ) {
 648                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 649                                 }
 650                         }
 651                 }
 652                 /* Look for exact match the first time */
 653                 if ( findcsn_retry ) {
 654                         cf.f_choice = LDAP_FILTER_EQUALITY;
 655                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 656                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 657                 /* On retry, look for <= */
 658                 } else {
 659                         cf.f_choice = LDAP_FILTER_LE;
 660                         fop.ors_limit = &fc_limits;
 661                         memset( &fc_limits, 0, sizeof( fc_limits ));
 662                         fc_limits.lms_s_unchecked = 1;
 663                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 664                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 665                 }
 666                 if ( fop.ors_filterstr.bv_len < 0 || fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 667                         return LDAP_OTHER;
 668                 }
 669                 fop.ors_attrsonly = 1;
 670                 fop.ors_attrs = slap_anlist_no_attrs;
 671                 fop.ors_slimit = 1;
 672                 cb.sc_private = NULL;
 673                 cb.sc_response = findcsn_cb;
 674                 break;
 675         case FIND_PRESENT:
 676                 fop.ors_filter = op->ors_filter;
 677                 fop.ors_filterstr = op->ors_filterstr;
 678                 fop.ors_attrsonly = 0;
 679                 fop.ors_attrs = uuid_anlist;
 680                 fop.ors_slimit = SLAP_NO_LIMIT;
 681                 cb.sc_private = &pcookie;
 682                 cb.sc_response = findpres_cb;
 683                 pcookie.num = 0;
 684
 685                 /* preallocate storage for a full set */
 686                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 687                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 688                         op->o_tmpmemctx );
 689                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 690                 pcookie.uuids[0].bv_val = pcookie.last;
 691                 pcookie.uuids[0].bv_len = UUID_LEN;
 692                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 693                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 694                         pcookie.uuids[i].bv_len = UUID_LEN;
 695                 }
 696                 break;
 697         }
 698
 699         if ( on->on_next )
 700                 fop.o_bd->bd_info = (BackendInfo *)on->on_next;
 701         else
 702                 fop.o_bd->bd_info = on->on_info->oi_orig;
 703         fop.o_bd->be_search( &fop, &frs );
 704         fop.o_bd->bd_info = (BackendInfo *)on;
 705
 706         switch( mode ) {
 707         case FIND_MAXCSN:
 708                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 709                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 710                         si->si_numops++;        /* ensure a checkpoint */
 711                 }
 712                 break;
 713         case FIND_CSN:
 714                 /* If matching CSN was not found, invalidate the context. */
 715                 if ( !cb.sc_private ) {
 716                         /* If we didn't find an exact match, then try for <= */
 717                         if ( findcsn_retry ) {
 718                                 findcsn_retry = 0;
 719                                 goto again;
 720                         }
 721                         rc = LDAP_NO_SUCH_OBJECT;
 722                 }
 723                 break;
 724         case FIND_PRESENT:
 725                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 726                 break;
 727         }
 728
 729         return rc;
 730 }
 731
 732 static void
 733 syncprov_free_syncop( syncops *so )
 734 {
 735         syncres *sr, *srnext;
 736         GroupAssertion *ga, *gnext;
 737
 738         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 739         if ( --so->s_inuse > 0 ) {
 740                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 741                 return;
 742         }
 743         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 744         if ( so->s_flags & PS_IS_DETACHED ) {
 745                 filter_free( so->s_op->ors_filter );
 746                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 747                         gnext = ga->ga_next;
 748                         ch_free( ga );
 749                 }
 750                 ch_free( so->s_op );
 751         }
 752         ch_free( so->s_base.bv_val );
 753         for ( sr=so->s_res; sr; sr=srnext ) {
 754                 srnext = sr->s_next;
 755                 ch_free( sr );
 756         }
 757         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 758         ch_free( so );
 759 }
 760
 761 /* Send a persistent search response */
 762 static int
 763 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 764         Entry **e, int mode )
 765 {
 766         slap_overinst *on = opc->son;
 767
 768         SlapReply rs = { REP_SEARCH };
 769         LDAPControl *ctrls[2];
 770         struct berval cookie, csns[2];
 771         Entry e_uuid = {0};
 772         Attribute a_uuid = {0};
 773
 774         if ( so->s_op->o_abandon )
 775                 return SLAPD_ABANDON;
 776
 777         ctrls[1] = NULL;
 778         csns[0] = opc->sctxcsn;
 779         BER_BVZERO( &csns[1] );
 780         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, so->s_sid );
 781
 782         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n", cookie.bv_val, 0, 0 );
 783
 784         e_uuid.e_attrs = &a_uuid;
 785         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 786         a_uuid.a_nvals = &opc->suuid;
 787         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 788                 mode, ctrls, 0, 1, &cookie );
 789         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 790
 791         rs.sr_ctrls = ctrls;
 792         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 793         switch( mode ) {
 794         case LDAP_SYNC_ADD:
 795                 rs.sr_entry = *e;
 796                 if ( rs.sr_entry->e_private )
 797                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 798                 if ( opc->sreference ) {
 799                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 800                         rs.sr_err = send_search_reference( op, &rs );
 801                         ber_bvarray_free( rs.sr_ref );
 802                         if ( !rs.sr_entry )
 803                                 *e = NULL;
 804                         break;
 805                 }
 806                 /* fallthru */
 807         case LDAP_SYNC_MODIFY:
 808                 rs.sr_entry = *e;
 809                 if ( rs.sr_entry->e_private )
 810                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 811                 rs.sr_attrs = op->ors_attrs;
 812                 rs.sr_err = send_search_entry( op, &rs );
 813                 if ( !rs.sr_entry )
 814                         *e = NULL;
 815                 break;
 816         case LDAP_SYNC_DELETE:
 817                 e_uuid.e_attrs = NULL;
 818                 e_uuid.e_name = opc->sdn;
 819                 e_uuid.e_nname = opc->sndn;
 820                 rs.sr_entry = &e_uuid;
 821                 if ( opc->sreference ) {
 822                         struct berval bv = BER_BVNULL;
 823                         rs.sr_ref = &bv;
 824                         rs.sr_err = send_search_reference( op, &rs );
 825                 } else {
 826                         rs.sr_err = send_search_entry( op, &rs );
 827                 }
 828                 break;
 829         default:
 830                 assert(0);
 831         }
 832         /* In case someone else freed it already? */
 833         if ( rs.sr_ctrls ) {
 834                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 835                 rs.sr_ctrls = NULL;
 836         }
 837
 838         return rs.sr_err;
 839 }
 840
 841 /* Play back queued responses */
 842 static int
 843 syncprov_qplay( Operation *op, struct re_s *rtask )
 844 {
 845         syncops *so = rtask->arg;
 846         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 847         syncres *sr;
 848         Entry *e;
 849         opcookie opc;
 850         int rc = 0;
 851
 852         opc.son = on;
 853
 854         for (;;) {
 855                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 856                 sr = so->s_res;
 857                 if ( sr )
 858                         so->s_res = sr->s_next;
 859                 if ( !so->s_res )
 860                         so->s_restail = NULL;
 861                 /* Exit loop with mutex held */
 862                 if ( !sr || so->s_op->o_abandon )
 863                         break;
 864                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 865
 866                 opc.sdn = sr->s_dn;
 867                 opc.sndn = sr->s_ndn;
 868                 opc.suuid = sr->s_uuid;
 869                 opc.sctxcsn = sr->s_csn;
 870                 opc.sreference = sr->s_isreference;
 871                 e = NULL;
 872
 873                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 874                         rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 875                         if ( rc ) {
 876                                 Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 877                                         "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 878                                 ch_free( sr );
 879                                 rc = 0;
 880                                 continue;
 881                         }
 882                 }
 883                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 884
 885                 if ( e ) {
 886                         overlay_entry_release_ov( op, e, 0, on );
 887                 }
 888
 889                 ch_free( sr );
 890
 891                 if ( rc ) {
 892                         /* Exit loop with mutex held */
 893                         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 894                         break;
 895                 }
 896         }
 897
 898         /* wait until we get explicitly scheduled again */
 899         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 900         ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
 901         if ( rc == 0 ) {
 902                 ldap_pvt_runqueue_resched( &slapd_rq, rtask, 1 );
 903         } else {
 904                 /* bail out on any error */
 905                 ldap_pvt_runqueue_remove( &slapd_rq, rtask );
 906         }
 907         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 908         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 909         return rc;
 910 }
 911
 912 /* runqueue task for playing back queued responses */
 913 static void *
 914 syncprov_qtask( void *ctx, void *arg )
 915 {
 916         struct re_s *rtask = arg;
 917         syncops *so = rtask->arg;
 918         OperationBuffer opbuf;
 919         Operation *op;
 920         BackendDB be;
 921         int rc;
 922
 923         op = &opbuf.ob_op;
 924         *op = *so->s_op;
 925         op->o_hdr = &opbuf.ob_hdr;
 926         op->o_controls = opbuf.ob_controls;
 927         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 928
 929         *op->o_hdr = *so->s_op->o_hdr;
 930
 931         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 932         op->o_tmpmfuncs = &slap_sl_mfuncs;
 933         op->o_threadctx = ctx;
 934
 935         /* syncprov_qplay expects a fake db */
 936         be = *so->s_op->o_bd;
 937         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 938         op->o_bd = &be;
 939         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 940         op->o_callback = NULL;
 941
 942         rc = syncprov_qplay( op, rtask );
 943
 944         /* decrement use count... */
 945         syncprov_free_syncop( so );
 946
 947 #if 0   /* FIXME: connection_close isn't exported from slapd.
 948                  * should it be?
 949                  */
 950         if ( rc ) {
 951                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 952                 if ( connection_state_closing( op->o_conn )) {
 953                         connection_close( op->o_conn );
 954                 }
 955                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 956         }
 957 #endif
 958         return NULL;
 959 }
 960
 961 /* Start the task to play back queued psearch responses */
 962 static void
 963 syncprov_qstart( syncops *so )
 964 {
 965         int wake=0;
 966         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 967         if ( !so->s_qtask ) {
 968                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 969                         syncprov_qtask, so, "syncprov_qtask",
 970                         so->s_op->o_conn->c_peer_name.bv_val );
 971                 ++so->s_inuse;
 972                 wake = 1;
 973         } else {
 974                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 975                         !so->s_qtask->next_sched.tv_sec ) {
 976                         so->s_qtask->interval.tv_sec = 0;
 977                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 978                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 979                         ++so->s_inuse;
 980                         wake = 1;
 981                 }
 982         }
 983         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 984         if ( wake )
 985                 slap_wake_listener();
 986 }
 987
 988 /* Queue a persistent search response */
 989 static int
 990 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 991 {
 992         syncres *sr;
 993         int sid, srsize;
 994
 995         /* Don't send changes back to their originator */
 996         sid = slap_parse_csn_sid( &opc->sctxcsn );
 997         if ( sid >= 0 && sid == so->s_sid )
 998                 return LDAP_SUCCESS;
 999
1000         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1001                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1002         if ( opc->sctxcsn.bv_len )
1003                 srsize += opc->sctxcsn.bv_len + 1;
1004         sr = ch_malloc( srsize );
1005         sr->s_next = NULL;
1006         sr->s_dn.bv_val = (char *)(sr + 1);
1007         sr->s_dn.bv_len = opc->sdn.bv_len;
1008         sr->s_mode = mode;
1009         sr->s_isreference = opc->sreference;
1010         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1011                  opc->sdn.bv_val ) + 1;
1012         sr->s_ndn.bv_len = opc->sndn.bv_len;
1013         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1014                  opc->sndn.bv_val ) + 1;
1015         sr->s_uuid.bv_len = opc->suuid.bv_len;
1016         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1017         if ( opc->sctxcsn.bv_len ) {
1018                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1019                 strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
1020         } else {
1021                 sr->s_csn.bv_val = NULL;
1022         }
1023         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
1024
1025         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1026         if ( !so->s_res ) {
1027                 so->s_res = sr;
1028         } else {
1029                 so->s_restail->s_next = sr;
1030         }
1031         so->s_restail = sr;
1032
1033         /* If the base of the psearch was modified, check it next time round */
1034         if ( so->s_flags & PS_WROTE_BASE ) {
1035                 so->s_flags ^= PS_WROTE_BASE;
1036                 so->s_flags |= PS_FIND_BASE;
1037         }
1038         if ( so->s_flags & PS_IS_DETACHED ) {
1039                 syncprov_qstart( so );
1040         }
1041         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1042         return LDAP_SUCCESS;
1043 }
1044
1045 static int
1046 syncprov_drop_psearch( syncops *so, int lock )
1047 {
1048         if ( so->s_flags & PS_IS_DETACHED ) {
1049                 if ( lock )
1050                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1051                 so->s_op->o_conn->c_n_ops_executing--;
1052                 so->s_op->o_conn->c_n_ops_completed++;
1053                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1054                         o_next );
1055                 if ( lock )
1056                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1057         }
1058         syncprov_free_syncop( so );
1059
1060         return 0;
1061 }
1062
1063 static int
1064 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1065 {
1066         slap_callback *sc = op->o_callback;
1067         op->o_callback = sc->sc_next;
1068         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1069         op->o_tmpfree( sc, op->o_tmpmemctx );
1070         return 0;
1071 }
1072
1073 static int
1074 syncprov_op_abandon( Operation *op, SlapReply *rs )
1075 {
1076         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1077         syncprov_info_t         *si = on->on_bi.bi_private;
1078         syncops *so, *soprev;
1079
1080         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1081         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1082                 soprev=so, so=so->s_next ) {
1083                 if ( so->s_op->o_connid == op->o_connid &&
1084                         so->s_op->o_msgid == op->orn_msgid ) {
1085                                 so->s_op->o_abandon = 1;
1086                                 soprev->s_next = so->s_next;
1087                                 break;
1088                 }
1089         }
1090         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1091         if ( so ) {
1092                 /* Is this really a Cancel exop? */
1093                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1094                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1095                         rs->sr_err = LDAP_CANCELLED;
1096                         send_ldap_result( so->s_op, rs );
1097                         if ( so->s_flags & PS_IS_DETACHED ) {
1098                                 slap_callback *cb;
1099                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1100                                 cb->sc_cleanup = syncprov_ab_cleanup;
1101                                 cb->sc_next = op->o_callback;
1102                                 cb->sc_private = so;
1103                                 return SLAP_CB_CONTINUE;
1104                         }
1105                 }
1106                 syncprov_drop_psearch( so, 0 );
1107         }
1108         return SLAP_CB_CONTINUE;
1109 }
1110
1111 /* Find which persistent searches are affected by this operation */
1112 static void
1113 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1114 {
1115         slap_overinst *on = opc->son;
1116         syncprov_info_t         *si = on->on_bi.bi_private;
1117
1118         fbase_cookie fc;
1119         syncops *ss, *sprev, *snext;
1120         Entry *e = NULL;
1121         Attribute *a;
1122         int rc;
1123         struct berval newdn;
1124         int freefdn = 0;
1125         BackendDB *b0 = op->o_bd, db;
1126
1127         fc.fdn = &op->o_req_ndn;
1128         /* compute new DN */
1129         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1130                 struct berval pdn;
1131                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1132                 else dnParent( fc.fdn, &pdn );
1133                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1134                 fc.fdn = &newdn;
1135                 freefdn = 1;
1136         }
1137         if ( op->o_tag != LDAP_REQ_ADD ) {
1138                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1139                         db = *op->o_bd;
1140                         op->o_bd = &db;
1141                 }
1142                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1143                 /* If we're sending responses now, make a copy and unlock the DB */
1144                 if ( e && !saveit ) {
1145                         Entry *e2 = entry_dup( e );
1146                         overlay_entry_release_ov( op, e, 0, on );
1147                         e = e2;
1148                 }
1149                 if ( rc ) {
1150                         op->o_bd = b0;
1151                         return;
1152                 }
1153         } else {
1154                 e = op->ora_e;
1155         }
1156
1157         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1158                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1159                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1160                 opc->sreference = is_entry_referral( e );
1161                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1162                 if ( a )
1163                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1164         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1165                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1166                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1167                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1168                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1169         }
1170
1171         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1172         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1173                 sprev = ss, ss=snext)
1174         {
1175                 syncmatches *sm;
1176                 int found = 0;
1177
1178                 snext = ss->s_next;
1179                 /* validate base */
1180                 fc.fss = ss;
1181                 fc.fbase = 0;
1182                 fc.fscope = 0;
1183
1184                 /* If the base of the search is missing, signal a refresh */
1185                 rc = syncprov_findbase( op, &fc );
1186                 if ( rc != LDAP_SUCCESS ) {
1187                         SlapReply rs = {REP_RESULT};
1188                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1189                                 "search base has changed" );
1190                         sprev->s_next = snext;
1191                         syncprov_drop_psearch( ss, 1 );
1192                         ss = sprev;
1193                         continue;
1194                 }
1195
1196
1197                 /* If we're sending results now, look for this op in old matches */
1198                 if ( !saveit ) {
1199                         syncmatches *old;
1200
1201                         /* Did we modify the search base? */
1202                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1203                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1204                                 ss->s_flags |= PS_WROTE_BASE;
1205                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1206                         }
1207
1208                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1209                                 old=sm, sm=sm->sm_next ) {
1210                                 if ( sm->sm_op == ss ) {
1211                                         found = 1;
1212                                         old->sm_next = sm->sm_next;
1213                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1214                                         break;
1215                                 }
1216                         }
1217                 }
1218
1219                 /* check if current o_req_dn is in scope and matches filter */
1220                 if ( fc.fscope && test_filter( ss->s_op, e, ss->s_op->ors_filter ) ==
1221                         LDAP_COMPARE_TRUE ) {
1222                         if ( saveit ) {
1223                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1224                                 sm->sm_next = opc->smatches;
1225                                 sm->sm_op = ss;
1226                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1227                                 ++ss->s_inuse;
1228                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1229                                 opc->smatches = sm;
1230                         } else {
1231                                 /* if found send UPDATE else send ADD */
1232                                 syncprov_qresp( opc, ss,
1233                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1234                         }
1235                 } else if ( !saveit && found ) {
1236                         /* send DELETE */
1237                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1238                 }
1239         }
1240         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1241
1242         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1243                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1244                         op->o_bd = &db;
1245                 }
1246                 overlay_entry_release_ov( op, e, 0, on );
1247                 op->o_bd = b0;
1248         }
1249         if ( freefdn ) {
1250                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1251         }
1252         op->o_bd = b0;
1253 }
1254
1255 static int
1256 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1257 {
1258         slap_callback *cb = op->o_callback;
1259         opcookie *opc = cb->sc_private;
1260         slap_overinst *on = opc->son;
1261         syncprov_info_t         *si = on->on_bi.bi_private;
1262         syncmatches *sm, *snext;
1263         modtarget *mt, mtdummy;
1264
1265         for (sm = opc->smatches; sm; sm=snext) {
1266                 snext = sm->sm_next;
1267                 syncprov_free_syncop( sm->sm_op );
1268                 op->o_tmpfree( sm, op->o_tmpmemctx );
1269         }
1270
1271         /* Remove op from lock table */
1272         mtdummy.mt_op = op;
1273         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1274         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1275         if ( mt ) {
1276                 modinst *mi = mt->mt_mods;
1277
1278                 /* If there are more, promote the next one */
1279                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1280                 if ( mi->mi_next ) {
1281                         mt->mt_mods = mi->mi_next;
1282                         mt->mt_op = mt->mt_mods->mi_op;
1283                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1284                 } else {
1285                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1286                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1287                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1288                         ch_free( mt );
1289                 }
1290         }
1291         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1292         if ( !BER_BVISNULL( &opc->suuid ))
1293                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1294         if ( !BER_BVISNULL( &opc->sndn ))
1295                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1296         if ( !BER_BVISNULL( &opc->sdn ))
1297                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1298         op->o_callback = cb->sc_next;
1299         op->o_tmpfree(cb, op->o_tmpmemctx);
1300
1301         return 0;
1302 }
1303
1304 static void
1305 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1306 {
1307         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1308         Modifications mod;
1309         Operation opm;
1310         SlapReply rsm = { 0 };
1311         slap_callback cb = {0};
1312         BackendDB be;
1313
1314         mod.sml_numvals = si->si_numcsns;
1315         mod.sml_values = si->si_ctxcsn;
1316         mod.sml_nvalues = NULL;
1317         mod.sml_desc = slap_schema.si_ad_contextCSN;
1318         mod.sml_op = LDAP_MOD_REPLACE;
1319         mod.sml_flags = 0;
1320         mod.sml_next = NULL;
1321
1322         cb.sc_response = slap_null_cb;
1323         opm = *op;
1324         opm.o_tag = LDAP_REQ_MODIFY;
1325         opm.o_callback = &cb;
1326         opm.orm_modlist = &mod;
1327         opm.orm_no_opattrs = 1;
1328         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1329                 be = *on->on_info->oi_origdb;
1330                 opm.o_bd = &be;
1331         }
1332         opm.o_req_dn = opm.o_bd->be_suffix[0];
1333         opm.o_req_ndn = opm.o_bd->be_nsuffix[0];
1334         opm.o_bd->bd_info = on->on_info->oi_orig;
1335         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1336         opm.o_no_schema_check = 1;
1337         opm.o_bd->be_modify( &opm, &rsm );
1338         if ( mod.sml_next != NULL ) {
1339                 slap_mods_free( mod.sml_next, 1 );
1340         }
1341 }
1342
1343 static void
1344 syncprov_add_slog( Operation *op )
1345 {
1346         opcookie *opc = op->o_callback->sc_private;
1347         slap_overinst *on = opc->son;
1348         syncprov_info_t         *si = on->on_bi.bi_private;
1349         sessionlog *sl;
1350         slog_entry *se;
1351
1352         sl = si->si_logs;
1353         {
1354                 /* Allocate a record. UUIDs are not NUL-terminated. */
1355                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1356                         op->o_csn.bv_len + 1 );
1357                 se->se_next = NULL;
1358                 se->se_tag = op->o_tag;
1359
1360                 se->se_uuid.bv_val = (char *)(&se[1]);
1361                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1362                 se->se_uuid.bv_len = opc->suuid.bv_len;
1363
1364                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1365                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1366                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1367                 se->se_csn.bv_len = op->o_csn.bv_len;
1368                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1369
1370                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1371                 if ( sl->sl_head ) {
1372                         sl->sl_tail->se_next = se;
1373                 } else {
1374                         sl->sl_head = se;
1375                 }
1376                 sl->sl_tail = se;
1377                 sl->sl_num++;
1378                 while ( sl->sl_num > sl->sl_size ) {
1379                         se = sl->sl_head;
1380                         sl->sl_head = se->se_next;
1381                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1382                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1383                         ch_free( se );
1384                         sl->sl_num--;
1385                 }
1386                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1387         }
1388 }
1389
1390 /* Just set a flag if we found the matching entry */
1391 static int
1392 playlog_cb( Operation *op, SlapReply *rs )
1393 {
1394         if ( rs->sr_type == REP_SEARCH ) {
1395                 op->o_callback->sc_private = (void *)1;
1396         }
1397         return rs->sr_err;
1398 }
1399
1400 /* enter with sl->sl_mutex locked, release before returning */
1401 static void
1402 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1403         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1404 {
1405         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1406         slog_entry *se;
1407         int i, j, ndel, num, nmods, mmods;
1408         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1409         BerVarray uuids;
1410         struct berval delcsn[2];
1411
1412         if ( !sl->sl_num ) {
1413                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1414                 return;
1415         }
1416
1417         num = sl->sl_num;
1418         i = 0;
1419         nmods = 0;
1420
1421         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1422                 num * UUID_LEN, op->o_tmpmemctx );
1423         uuids[0].bv_val = (char *)(uuids + num + 1);
1424
1425         delcsn[0].bv_len = 0;
1426         delcsn[0].bv_val = cbuf;
1427         BER_BVZERO(&delcsn[1]);
1428
1429         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1430          * and everything else at the end. Do this first so we can
1431          * unlock the list mutex.
1432          */
1433         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1434                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1435         for ( se=sl->sl_head; se; se=se->se_next ) {
1436                 int k;
1437                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1438                 ndel = 1;
1439                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1440                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1441                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1442                                 break;
1443                         }
1444                 }
1445                 if ( ndel <= 0 ) {
1446                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1447                         continue;
1448                 }
1449                 ndel = 0;
1450                 for ( k=0; k<numcsns; k++ ) {
1451                         if ( se->se_sid == sids[k] ) {
1452                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1453                                 break;
1454                         }
1455                 }
1456                 if ( ndel > 0 ) {
1457                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1458                         break;
1459                 }
1460                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1461                         j = i;
1462                         i++;
1463                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1464                         delcsn[0].bv_len = se->se_csn.bv_len;
1465                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1466                 } else {
1467                         nmods++;
1468                         j = num - nmods;
1469                 }
1470                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1471                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1472                 uuids[j].bv_len = UUID_LEN;
1473         }
1474         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1475
1476         ndel = i;
1477
1478         /* Zero out unused slots */
1479         for ( i=ndel; i < num - nmods; i++ )
1480                 uuids[i].bv_len = 0;
1481
1482         /* Mods must be validated to see if they belong in this delete set.
1483          */
1484
1485         mmods = nmods;
1486         /* Strip any duplicates */
1487         for ( i=0; i<nmods; i++ ) {
1488                 for ( j=0; j<ndel; j++ ) {
1489                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1490                                 uuids[num - 1 - i].bv_len = 0;
1491                                 mmods --;
1492                                 break;
1493                         }
1494                 }
1495                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1496                 for ( j=0; j<i; j++ ) {
1497                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1498                                 uuids[num - 1 - i].bv_len = 0;
1499                                 mmods --;
1500                                 break;
1501                         }
1502                 }
1503         }
1504
1505         if ( mmods ) {
1506                 Operation fop;
1507                 SlapReply frs = { REP_RESULT };
1508                 int rc;
1509                 Filter mf, af;
1510                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1511                 slap_callback cb = {0};
1512
1513                 fop = *op;
1514
1515                 fop.o_sync_mode = 0;
1516                 fop.o_callback = &cb;
1517                 fop.ors_limit = NULL;
1518                 fop.ors_tlimit = SLAP_NO_LIMIT;
1519                 fop.ors_attrs = slap_anlist_all_attributes;
1520                 fop.ors_attrsonly = 0;
1521                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1522
1523                 af.f_choice = LDAP_FILTER_AND;
1524                 af.f_next = NULL;
1525                 af.f_and = &mf;
1526                 mf.f_choice = LDAP_FILTER_EQUALITY;
1527                 mf.f_ava = &eq;
1528                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1529                 mf.f_next = fop.ors_filter;
1530
1531                 fop.ors_filter = &af;
1532
1533                 cb.sc_response = playlog_cb;
1534                 if ( on->on_next )
1535                         fop.o_bd->bd_info = (BackendInfo *)on->on_next;
1536                 else
1537                         fop.o_bd->bd_info = on->on_info->oi_orig;
1538
1539                 for ( i=ndel; i<num; i++ ) {
1540                         if ( uuids[i].bv_len == 0 ) continue;
1541
1542                         mf.f_av_value = uuids[i];
1543                         cb.sc_private = NULL;
1544                         fop.ors_slimit = 1;
1545                         frs.sr_nentries = 0;
1546                         rc = fop.o_bd->be_search( &fop, &frs );
1547
1548                         /* If entry was not found, add to delete list */
1549                         if ( !cb.sc_private ) {
1550                                 uuids[ndel++] = uuids[i];
1551                         }
1552                 }
1553                 fop.o_bd->bd_info = (BackendInfo *)on;
1554         }
1555         if ( ndel ) {
1556                 struct berval cookie;
1557
1558                 slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1559                         srs->sr_state.sid );
1560
1561                 Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1562
1563                 uuids[ndel].bv_val = NULL;
1564                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, &cookie, 0, uuids, 1 );
1565                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1566         }
1567         op->o_tmpfree( uuids, op->o_tmpmemctx );
1568 }
1569
1570 static int
1571 syncprov_op_response( Operation *op, SlapReply *rs )
1572 {
1573         opcookie *opc = op->o_callback->sc_private;
1574         slap_overinst *on = opc->son;
1575         syncprov_info_t         *si = on->on_bi.bi_private;
1576         syncmatches *sm;
1577
1578         if ( rs->sr_err == LDAP_SUCCESS )
1579         {
1580                 struct berval maxcsn = BER_BVNULL;
1581                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1582                 int do_check = 0, have_psearches;
1583
1584                 /* Update our context CSN */
1585                 cbuf[0] = '\0';
1586                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1587                 slap_get_commit_csn( op, &maxcsn );
1588                 if ( !BER_BVISNULL( &maxcsn ) ) {
1589                         int i, sid;
1590                         strcpy( cbuf, maxcsn.bv_val );
1591                         sid = slap_parse_csn_sid( &maxcsn );
1592                         for ( i=0; i<si->si_numcsns; i++ ) {
1593                                 if ( sid == si->si_sids[i] ) {
1594                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1595                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1596                                         }
1597                                         break;
1598                                 }
1599                         }
1600                         /* It's a new SID for us */
1601                         if ( i == si->si_numcsns ) {
1602                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1603                                 si->si_numcsns++;
1604                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1605                                         sizeof(int));
1606                                 si->si_sids[i] = sid;
1607                         }
1608                 }
1609
1610                 /* Don't do any processing for consumer contextCSN updates */
1611                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1612                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1613                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1614                         return SLAP_CB_CONTINUE;
1615                 }
1616
1617                 si->si_numops++;
1618                 if ( si->si_chkops || si->si_chktime ) {
1619                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1620                                 do_check = 1;
1621                                 si->si_numops = 0;
1622                         }
1623                         if ( si->si_chktime &&
1624                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1625                                 if ( si->si_chklast ) {
1626                                         do_check = 1;
1627                                         si->si_chklast = op->o_time;
1628                                 } else {
1629                                         si->si_chklast = 1;
1630                                 }
1631                         }
1632                 }
1633                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1634
1635                 if ( do_check ) {
1636                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1637                         syncprov_checkpoint( op, rs, on );
1638                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1639                 }
1640
1641                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1642                 opc->sctxcsn.bv_val = cbuf;
1643
1644                 /* Handle any persistent searches */
1645                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1646                 have_psearches = ( si->si_ops != NULL );
1647                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1648                 if ( have_psearches ) {
1649                         switch(op->o_tag) {
1650                         case LDAP_REQ_ADD:
1651                         case LDAP_REQ_MODIFY:
1652                         case LDAP_REQ_MODRDN:
1653                         case LDAP_REQ_EXTENDED:
1654                                 syncprov_matchops( op, opc, 0 );
1655                                 break;
1656                         case LDAP_REQ_DELETE:
1657                                 /* for each match in opc->smatches:
1658                                  *   send DELETE msg
1659                                  */
1660                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1661                                         if ( sm->sm_op->s_op->o_abandon )
1662                                                 continue;
1663                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1664                                 }
1665                                 break;
1666                         }
1667                 }
1668
1669                 /* Add any log records */
1670                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1671                         syncprov_add_slog( op );
1672                 }
1673
1674         }
1675         return SLAP_CB_CONTINUE;
1676 }
1677
1678 /* We don't use a subentry to store the context CSN any more.
1679  * We expose the current context CSN as an operational attribute
1680  * of the suffix entry.
1681  */
1682 static int
1683 syncprov_op_compare( Operation *op, SlapReply *rs )
1684 {
1685         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1686         syncprov_info_t         *si = on->on_bi.bi_private;
1687         int rc = SLAP_CB_CONTINUE;
1688
1689         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1690                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1691         {
1692                 Entry e = {0};
1693                 Attribute a = {0};
1694
1695                 e.e_name = op->o_bd->be_suffix[0];
1696                 e.e_nname = op->o_bd->be_nsuffix[0];
1697                 e.e_attrs = &a;
1698
1699                 a.a_desc = slap_schema.si_ad_contextCSN;
1700
1701                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1702
1703                 a.a_vals = si->si_ctxcsn;
1704                 a.a_nvals = a.a_vals;
1705
1706                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1707                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1708                 if ( ! rs->sr_err ) {
1709                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1710                         goto return_results;
1711                 }
1712
1713                 if ( get_assert( op ) &&
1714                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1715                 {
1716                         rs->sr_err = LDAP_ASSERTION_FAILED;
1717                         goto return_results;
1718                 }
1719
1720
1721                 rs->sr_err = LDAP_COMPARE_FALSE;
1722
1723                 if ( attr_valfind( &a,
1724                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1725                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1726                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1727                 {
1728                         rs->sr_err = LDAP_COMPARE_TRUE;
1729                 }
1730
1731 return_results:;
1732
1733                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1734
1735                 send_ldap_result( op, rs );
1736
1737                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1738                         rs->sr_err = LDAP_SUCCESS;
1739                 }
1740                 rc = rs->sr_err;
1741         }
1742
1743         return rc;
1744 }
1745
1746 static int
1747 syncprov_op_mod( Operation *op, SlapReply *rs )
1748 {
1749         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1750         syncprov_info_t         *si = on->on_bi.bi_private;
1751         slap_callback *cb;
1752         opcookie *opc;
1753         int have_psearches, cbsize;
1754
1755         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1756         have_psearches = ( si->si_ops != NULL );
1757         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1758
1759         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1760                 (have_psearches ? sizeof(modinst) : 0 );
1761
1762         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1763         opc = (opcookie *)(cb+1);
1764         opc->son = on;
1765         cb->sc_response = syncprov_op_response;
1766         cb->sc_cleanup = syncprov_op_cleanup;
1767         cb->sc_private = opc;
1768         cb->sc_next = op->o_callback;
1769         op->o_callback = cb;
1770
1771         /* If there are active persistent searches, lock this operation.
1772          * See seqmod.c for the locking logic on its own.
1773          */
1774         if ( have_psearches ) {
1775                 modtarget *mt, mtdummy;
1776                 modinst *mi;
1777
1778                 mi = (modinst *)(opc+1);
1779                 mi->mi_op = op;
1780
1781                 /* See if we're already modifying this entry... */
1782                 mtdummy.mt_op = op;
1783                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1784                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1785                 if ( mt ) {
1786                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1787                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1788                         mt->mt_tail->mi_next = mi;
1789                         mt->mt_tail = mi;
1790                         /* wait for this op to get to head of list */
1791                         while ( mt->mt_mods != mi ) {
1792                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1793                                 /* FIXME: if dynamic config can delete overlays or
1794                                  * databases we'll have to check for cleanup here.
1795                                  * Currently it's not an issue because there are
1796                                  * no dynamic config deletes...
1797                                  */
1798                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1799                                         ldap_pvt_thread_yield();
1800                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1801
1802                                 /* clean up if the caller is giving up */
1803                                 if ( op->o_abandon ) {
1804                                         modinst *m2;
1805                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1806                                                 m2 = m2->mi_next );
1807                                         m2->mi_next = mi->mi_next;
1808                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1809                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1810                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1811                                         return SLAPD_ABANDON;
1812                                 }
1813                         }
1814                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1815                 } else {
1816                         /* Record that we're modifying this entry now */
1817                         mt = ch_malloc( sizeof(modtarget) );
1818                         mt->mt_mods = mi;
1819                         mt->mt_tail = mi;
1820                         mt->mt_op = mi->mi_op;
1821                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1822                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1823                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1824                 }
1825         }
1826
1827         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1828                 syncprov_matchops( op, opc, 1 );
1829
1830         return SLAP_CB_CONTINUE;
1831 }
1832
1833 static int
1834 syncprov_op_extended( Operation *op, SlapReply *rs )
1835 {
1836         if ( exop_is_write( op ))
1837                 return syncprov_op_mod( op, rs );
1838
1839         return SLAP_CB_CONTINUE;
1840 }
1841
1842 typedef struct searchstate {
1843         slap_overinst *ss_on;
1844         syncops *ss_so;
1845         BerVarray ss_ctxcsn;
1846         int *ss_sids;
1847         int ss_numcsns;
1848 #define SS_PRESENT      0x01
1849 #define SS_CHANGED      0x02
1850         int ss_flags;
1851 } searchstate;
1852
1853 static int
1854 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1855 {
1856         if ( rs->sr_ctrls ) {
1857                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1858                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1859                 rs->sr_ctrls = NULL;
1860         }
1861         return 0;
1862 }
1863
1864 typedef struct SyncOperationBuffer {
1865         Operation               sob_op;
1866         Opheader                sob_hdr;
1867         OpExtra                 sob_oe;
1868         AttributeName   sob_extra;      /* not always present */
1869         /* Further data allocated here */
1870 } SyncOperationBuffer;
1871
1872 static void
1873 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1874 {
1875         SyncOperationBuffer *sopbuf2;
1876         Operation *op2;
1877         int i, alen = 0;
1878         size_t size;
1879         char *ptr;
1880         GroupAssertion *g1, *g2;
1881
1882         /* count the search attrs */
1883         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1884                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1885         }
1886         /* Make a new copy of the operation */
1887         size = offsetof( SyncOperationBuffer, sob_extra ) +
1888                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1889                 op->o_req_dn.bv_len + 1 +
1890                 op->o_req_ndn.bv_len + 1 +
1891                 op->o_ndn.bv_len + 1 +
1892                 so->s_filterstr.bv_len + 1;
1893         sopbuf2 = ch_calloc( 1, size );
1894         op2 = &sopbuf2->sob_op;
1895         op2->o_hdr = &sopbuf2->sob_hdr;
1896         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
1897
1898         /* Copy the fields we care about explicitly, leave the rest alone */
1899         *op2->o_hdr = *op->o_hdr;
1900         op2->o_tag = op->o_tag;
1901         op2->o_time = op->o_time;
1902         op2->o_bd = on->on_info->oi_origdb;
1903         op2->o_request = op->o_request;
1904         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
1905         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
1906
1907         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
1908         if ( i ) {
1909                 op2->ors_attrs = (AttributeName *) ptr;
1910                 ptr = (char *) &op2->ors_attrs[i+1];
1911                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1912                         op2->ors_attrs[i] = op->ors_attrs[i];
1913                         op2->ors_attrs[i].an_name.bv_val = ptr;
1914                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1915                 }
1916                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1917         }
1918
1919         op2->o_authz = op->o_authz;
1920         op2->o_ndn.bv_val = ptr;
1921         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1922         op2->o_dn = op2->o_ndn;
1923         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1924         op2->o_req_dn.bv_val = ptr;
1925         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1926         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1927         op2->o_req_ndn.bv_val = ptr;
1928         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1929         op2->ors_filterstr.bv_val = ptr;
1930         strcpy( ptr, so->s_filterstr.bv_val );
1931         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1932
1933         /* Skip the AND/GE clause that we stuck on in front */
1934         if ( so->s_flags & PS_FIX_FILTER ) {
1935                 op2->ors_filter = op->ors_filter->f_and->f_next;
1936                 so->s_flags ^= PS_FIX_FILTER;
1937         } else {
1938                 op2->ors_filter = op->ors_filter;
1939         }
1940         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
1941         so->s_op = op2;
1942
1943         /* Copy any cached group ACLs individually */
1944         op2->o_groups = NULL;
1945         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1946                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1947                 *g2 = *g1;
1948                 strcpy( g2->ga_ndn, g1->ga_ndn );
1949                 g2->ga_next = op2->o_groups;
1950                 op2->o_groups = g2;
1951         }
1952         /* Don't allow any further group caching */
1953         op2->o_do_not_cache = 1;
1954
1955         /* Add op2 to conn so abandon will find us */
1956         op->o_conn->c_n_ops_executing++;
1957         op->o_conn->c_n_ops_completed--;
1958         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1959         so->s_flags |= PS_IS_DETACHED;
1960
1961         /* Prevent anyone else from trying to send a result for this op */
1962         op->o_abandon = 1;
1963 }
1964
1965 static int
1966 syncprov_search_response( Operation *op, SlapReply *rs )
1967 {
1968         searchstate *ss = op->o_callback->sc_private;
1969         slap_overinst *on = ss->ss_on;
1970         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1971
1972         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1973                 Attribute *a;
1974                 /* If we got a referral without a referral object, there's
1975                  * something missing that we cannot replicate. Just ignore it.
1976                  * The consumer will abort because we didn't send the expected
1977                  * control.
1978                  */
1979                 if ( !rs->sr_entry ) {
1980                         assert( rs->sr_entry != NULL );
1981                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1982                         return SLAP_CB_CONTINUE;
1983                 }
1984                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1985                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
1986                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
1987                 }
1988                 if ( a ) {
1989                         int i, sid;
1990                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
1991
1992                         /* Don't send changed entries back to the originator */
1993                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
1994                                 Debug( LDAP_DEBUG_SYNC,
1995                                         "Entry %s changed by peer, ignored\n",
1996                                         rs->sr_entry->e_name.bv_val, 0, 0 );
1997                                 return LDAP_SUCCESS;
1998                         }
1999
2000                         /* If not a persistent search */
2001                         if ( !ss->ss_so ) {
2002                                 /* Make sure entry is less than the snapshot'd contextCSN */
2003                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2004                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2005                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2006                                                 Debug( LDAP_DEBUG_SYNC,
2007                                                         "Entry %s CSN %s greater than snapshot %s\n",
2008                                                         rs->sr_entry->e_name.bv_val,
2009                                                         a->a_nvals[0].bv_val,
2010                                                         ss->ss_ctxcsn[i].bv_val );
2011                                                 return LDAP_SUCCESS;
2012                                         }
2013                                 }
2014                         }
2015
2016                         /* Don't send old entries twice */
2017                         if ( srs->sr_state.ctxcsn ) {
2018                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2019                                         if ( sid == srs->sr_state.sids[i] &&
2020                                                 ber_bvcmp( &a->a_nvals[0],
2021                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2022                                                 Debug( LDAP_DEBUG_SYNC,
2023                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2024                                                         rs->sr_entry->e_name.bv_val,
2025                                                         a->a_nvals[0].bv_val,
2026                                                         srs->sr_state.ctxcsn[i].bv_val );
2027                                                 return LDAP_SUCCESS;
2028                                         }
2029                                 }
2030                         }
2031                 }
2032                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2033                         op->o_tmpmemctx );
2034                 rs->sr_ctrls[1] = NULL;
2035                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2036                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2037         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2038                 struct berval cookie;
2039
2040                 if ( ss->ss_flags & SS_CHANGED ) {
2041                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2042                                 srs->sr_state.rid, srs->sr_state.sid );
2043
2044                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2045                 }
2046
2047                 /* Is this a regular refresh?
2048                  * Note: refresh never gets here if there were no changes
2049                  */
2050                 if ( !ss->ss_so ) {
2051                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2052                                 op->o_tmpmemctx );
2053                         rs->sr_ctrls[1] = NULL;
2054                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2055                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2056                                         LDAP_SYNC_REFRESH_DELETES );
2057                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2058                 } else {
2059                 /* It's RefreshAndPersist, transition to Persist phase */
2060                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2061                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2062                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2063                                 1, NULL, 0 );
2064                         if ( ss->ss_flags & SS_CHANGED )
2065                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2066
2067                         /* Detach this Op from frontend control */
2068                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2069                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2070
2071                         /* But not if this connection was closed along the way */
2072                         if ( op->o_abandon ) {
2073                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2074                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2075                                 syncprov_free_syncop( ss->ss_so );
2076                                 return SLAPD_ABANDON;
2077
2078                         } else {
2079                                 /* Turn off the refreshing flag */
2080                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2081
2082                                 syncprov_detach_op( op, ss->ss_so, on );
2083
2084                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2085
2086                                 /* If there are queued responses, fire them off */
2087                                 if ( ss->ss_so->s_res )
2088                                         syncprov_qstart( ss->ss_so );
2089                         }
2090                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2091
2092                         return LDAP_SUCCESS;
2093                 }
2094         }
2095
2096         return SLAP_CB_CONTINUE;
2097 }
2098
2099 static int
2100 syncprov_op_search( Operation *op, SlapReply *rs )
2101 {
2102         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2103         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2104         slap_callback   *cb;
2105         int gotstate = 0, changed = 0, do_present = 0;
2106         syncops *sop = NULL;
2107         searchstate *ss;
2108         sync_control *srs;
2109         BerVarray ctxcsn;
2110         int i, *sids, numcsns;
2111         struct berval mincsn;
2112
2113         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2114
2115         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2116                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2117                 return rs->sr_err;
2118         }
2119
2120         srs = op->o_controls[slap_cids.sc_LDAPsync];
2121         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
2122
2123         /* If this is a persistent search, set it up right away */
2124         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2125                 syncops so = {0};
2126                 fbase_cookie fc;
2127                 opcookie opc;
2128                 slap_callback sc;
2129
2130                 fc.fss = &so;
2131                 fc.fbase = 0;
2132                 so.s_eid = NOID;
2133                 so.s_op = op;
2134                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2135                 /* syncprov_findbase expects to be called as a callback... */
2136                 sc.sc_private = &opc;
2137                 opc.son = on;
2138                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2139                 cb = op->o_callback;
2140                 op->o_callback = &sc;
2141                 rs->sr_err = syncprov_findbase( op, &fc );
2142                 op->o_callback = cb;
2143                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2144
2145                 if ( rs->sr_err != LDAP_SUCCESS ) {
2146                         send_ldap_result( op, rs );
2147                         return rs->sr_err;
2148                 }
2149                 sop = ch_malloc( sizeof( syncops ));
2150                 *sop = so;
2151                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2152                 sop->s_rid = srs->sr_state.rid;
2153                 sop->s_sid = srs->sr_state.sid;
2154                 sop->s_inuse = 1;
2155
2156                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2157                 sop->s_next = si->si_ops;
2158                 si->si_ops = sop;
2159                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2160         }
2161
2162         /* snapshot the ctxcsn */
2163         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2164         numcsns = si->si_numcsns;
2165         if ( numcsns ) {
2166                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2167                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2168                 for ( i=0; i<numcsns; i++ )
2169                         sids[i] = si->si_sids[i];
2170         } else {
2171                 ctxcsn = NULL;
2172                 sids = NULL;
2173         }
2174         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2175
2176         /* If we have a cookie, handle the PRESENT lookups */
2177         if ( srs->sr_state.ctxcsn ) {
2178                 sessionlog *sl;
2179                 int i, j;
2180
2181                 /* If we don't have any CSN of our own yet, pretend nothing
2182                  * has changed.
2183                  */
2184                 if ( !numcsns )
2185                         goto no_change;
2186
2187                 if ( !si->si_nopres )
2188                         do_present = SS_PRESENT;
2189
2190                 /* If there are SIDs we don't recognize in the cookie, drop them */
2191                 for (i=0; i<srs->sr_state.numcsns; ) {
2192                         for (j=0; j<numcsns; j++) {
2193                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2194                                         break;
2195                                 }
2196                         }
2197                         /* not found */
2198                         if ( j == numcsns ) {
2199                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2200                                 j = srs->sr_state.numcsns - 1;
2201                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2202                                 tmp.bv_len = 0;
2203                                 srs->sr_state.ctxcsn[j] = tmp;
2204                                 srs->sr_state.numcsns = j;
2205                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2206                                 continue;
2207                         }
2208                         i++;
2209                 }
2210
2211                 /* Find the smallest CSN */
2212                 mincsn = srs->sr_state.ctxcsn[0];
2213                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2214                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2215                                 mincsn = srs->sr_state.ctxcsn[i];
2216                 }
2217
2218                 /* If nothing has changed, shortcut it */
2219                 if ( srs->sr_state.numcsns == numcsns ) {
2220                         int i, j;
2221                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2222                                 for ( j=0; j<numcsns; j++ ) {
2223                                         if ( srs->sr_state.sids[i] != sids[j] )
2224                                                 continue;
2225                                         if ( !bvmatch( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ))
2226                                                 changed = SS_CHANGED;
2227                                         break;
2228                                 }
2229                                 if ( changed )
2230                                         break;
2231                         }
2232                         if ( !changed ) {
2233                                 do_present = 0;
2234 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2235                                         LDAPControl     *ctrls[2];
2236
2237                                         ctrls[0] = NULL;
2238                                         ctrls[1] = NULL;
2239                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2240                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2241                                         rs->sr_ctrls = ctrls;
2242                                         rs->sr_err = LDAP_SUCCESS;
2243                                         send_ldap_result( op, rs );
2244                                         rs->sr_ctrls = NULL;
2245                                         return rs->sr_err;
2246                                 }
2247                                 goto shortcut;
2248                         }
2249                 }
2250                 /* Do we have a sessionlog for this search? */
2251                 sl=si->si_logs;
2252                 if ( sl ) {
2253                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2254                         /* Are there any log entries, and is the consumer state
2255                          * present in the session log?
2256                          */
2257                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2258                                 do_present = 0;
2259                                 /* mutex is unlocked in playlog */
2260                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2261                         } else {
2262                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2263                         }
2264                 }
2265                 /* Is the CSN still present in the database? */
2266                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2267                         /* No, so a reload is required */
2268                         /* the 2.2 consumer doesn't send this hint */
2269                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2270                                 if ( ctxcsn )
2271                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2272                                 if ( sids )
2273                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2274                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2275                                 return rs->sr_err;
2276                         }
2277                 } else {
2278                         gotstate = 1;
2279                         /* If changed and doing Present lookup, send Present UUIDs */
2280                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2281                                 LDAP_SUCCESS ) {
2282                                 if ( ctxcsn )
2283                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2284                                 if ( sids )
2285                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2286                                 send_ldap_result( op, rs );
2287                                 return rs->sr_err;
2288                         }
2289                 }
2290         } else {
2291                 /* No consumer state, assume something has changed */
2292                 changed = SS_CHANGED;
2293         }
2294
2295 shortcut:
2296         /* Append CSN range to search filter, save original filter
2297          * for persistent search evaluation
2298          */
2299         if ( sop ) {
2300                 sop->s_filterstr= op->ors_filterstr;
2301         }
2302
2303         /* If something changed, find the changes */
2304         if ( gotstate && changed ) {
2305                 Filter *fand, *fava;
2306
2307                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2308                 fand->f_choice = LDAP_FILTER_AND;
2309                 fand->f_next = NULL;
2310                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2311                 fand->f_and = fava;
2312                 fava->f_choice = LDAP_FILTER_GE;
2313                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2314                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2315 #ifdef LDAP_COMP_MATCH
2316                 fava->f_ava->aa_cf = NULL;
2317 #endif
2318                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2319                 fava->f_next = op->ors_filter;
2320                 op->ors_filter = fand;
2321                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2322                 if ( sop )
2323                         sop->s_flags |= PS_FIX_FILTER;
2324         }
2325
2326         /* Let our callback add needed info to returned entries */
2327         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2328         ss = (searchstate *)(cb+1);
2329         ss->ss_on = on;
2330         ss->ss_so = sop;
2331         ss->ss_flags = do_present | changed;
2332         ss->ss_ctxcsn = ctxcsn;
2333         ss->ss_numcsns = numcsns;
2334         ss->ss_sids = sids;
2335         cb->sc_response = syncprov_search_response;
2336         cb->sc_cleanup = syncprov_search_cleanup;
2337         cb->sc_private = ss;
2338         cb->sc_next = op->o_callback;
2339         op->o_callback = cb;
2340
2341         /* If this is a persistent search and no changes were reported during
2342          * the refresh phase, just invoke the response callback to transition
2343          * us into persist phase
2344          */
2345         if ( !changed ) {
2346                 rs->sr_err = LDAP_SUCCESS;
2347                 rs->sr_nentries = 0;
2348                 send_ldap_result( op, rs );
2349                 return rs->sr_err;
2350         }
2351         return SLAP_CB_CONTINUE;
2352 }
2353
2354 static int
2355 syncprov_operational(
2356         Operation *op,
2357         SlapReply *rs )
2358 {
2359         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2360         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2361
2362         /* This prevents generating unnecessarily; frontend will strip
2363          * any statically stored copy.
2364          */
2365         if ( op->o_sync != SLAP_CONTROL_NONE )
2366                 return SLAP_CB_CONTINUE;
2367
2368         if ( rs->sr_entry &&
2369                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2370
2371                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2372                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2373                         Attribute *a, **ap = NULL;
2374
2375                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2376                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2377                                         break;
2378                         }
2379
2380                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2381                         if ( si->si_ctxcsn ) {
2382                                 if ( !a ) {
2383                                         for ( ap = &rs->sr_operational_attrs; *ap;
2384                                                 ap=&(*ap)->a_next );
2385
2386                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2387                                         *ap = a;
2388                                 }
2389
2390                                 if ( !ap ) {
2391                                         if ( !rs->sr_flags & REP_ENTRY_MODIFIABLE ) {
2392                                                 rs->sr_entry = entry_dup( rs->sr_entry );
2393                                                 rs->sr_flags |=
2394                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2395                                                 a = attr_find( rs->sr_entry->e_attrs,
2396                                                         slap_schema.si_ad_contextCSN );
2397                                         }
2398                                         if ( a->a_nvals != a->a_vals ) {
2399                                                 ber_bvarray_free( a->a_nvals );
2400                                         }
2401                                         a->a_nvals = NULL;
2402                                         ber_bvarray_free( a->a_vals );
2403                                         a->a_vals = NULL;
2404                                         a->a_numvals = 0;
2405                                 }
2406                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2407                         }
2408                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2409                 }
2410         }
2411         return SLAP_CB_CONTINUE;
2412 }
2413
2414 enum {
2415         SP_CHKPT = 1,
2416         SP_SESSL,
2417         SP_NOPRES,
2418         SP_USEHINT
2419 };
2420
2421 static ConfigDriver sp_cf_gen;
2422
2423 static ConfigTable spcfg[] = {
2424         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2425                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2426                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2427                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2428         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2429                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2430                         "DESC 'Session log size in ops' "
2431                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2432         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2433                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2434                         "DESC 'Omit Present phase processing' "
2435                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2436         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2437                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2438                         "DESC 'Observe Reload Hint in Request control' "
2439                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2440         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2441 };
2442
2443 static ConfigOCs spocs[] = {
2444         { "( OLcfgOvOc:1.1 "
2445                 "NAME 'olcSyncProvConfig' "
2446                 "DESC 'SyncRepl Provider configuration' "
2447                 "SUP olcOverlayConfig "
2448                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2449                         Cft_Overlay, spcfg },
2450         { NULL, 0, NULL }
2451 };
2452
2453 static int
2454 sp_cf_gen(ConfigArgs *c)
2455 {
2456         slap_overinst           *on = (slap_overinst *)c->bi;
2457         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2458         int rc = 0;
2459
2460         if ( c->op == SLAP_CONFIG_EMIT ) {
2461                 switch ( c->type ) {
2462                 case SP_CHKPT:
2463                         if ( si->si_chkops || si->si_chktime ) {
2464                                 struct berval bv;
2465                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2466                                         "%d %d", si->si_chkops, si->si_chktime );
2467                                 if ( bv.bv_len < 0 || bv.bv_len >= sizeof( c->cr_msg ) ) {
2468                                         rc = 1;
2469                                 } else {
2470                                         bv.bv_val = c->cr_msg;
2471                                         value_add_one( &c->rvalue_vals, &bv );
2472                                 }
2473                         } else {
2474                                 rc = 1;
2475                         }
2476                         break;
2477                 case SP_SESSL:
2478                         if ( si->si_logs ) {
2479                                 c->value_int = si->si_logs->sl_size;
2480                         } else {
2481                                 rc = 1;
2482                         }
2483                         break;
2484                 case SP_NOPRES:
2485                         if ( si->si_nopres ) {
2486                                 c->value_int = 1;
2487                         } else {
2488                                 rc = 1;
2489                         }
2490                         break;
2491                 case SP_USEHINT:
2492                         if ( si->si_usehint ) {
2493                                 c->value_int = 1;
2494                         } else {
2495                                 rc = 1;
2496                         }
2497                         break;
2498                 }
2499                 return rc;
2500         } else if ( c->op == LDAP_MOD_DELETE ) {
2501                 switch ( c->type ) {
2502                 case SP_CHKPT:
2503                         si->si_chkops = 0;
2504                         si->si_chktime = 0;
2505                         break;
2506                 case SP_SESSL:
2507                         if ( si->si_logs )
2508                                 si->si_logs->sl_size = 0;
2509                         else
2510                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2511                         break;
2512                 case SP_NOPRES:
2513                         if ( si->si_nopres )
2514                                 si->si_nopres = 0;
2515                         else
2516                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2517                         break;
2518                 case SP_USEHINT:
2519                         if ( si->si_usehint )
2520                                 si->si_usehint = 0;
2521                         else
2522                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2523                         break;
2524                 }
2525                 return rc;
2526         }
2527         switch ( c->type ) {
2528         case SP_CHKPT:
2529                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2530                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2531                                 c->argv[0], c->argv[1] );
2532                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2533                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2534                         return ARG_BAD_CONF;
2535                 }
2536                 if ( si->si_chkops <= 0 ) {
2537                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2538                                 c->argv[0], si->si_chkops );
2539                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2540                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2541                         return ARG_BAD_CONF;
2542                 }
2543                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2544                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2545                                 c->argv[0], c->argv[1] );
2546                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2547                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2548                         return ARG_BAD_CONF;
2549                 }
2550                 if ( si->si_chktime <= 0 ) {
2551                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2552                                 c->argv[0], si->si_chkops );
2553                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2554                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2555                         return ARG_BAD_CONF;
2556                 }
2557                 si->si_chktime *= 60;
2558                 break;
2559         case SP_SESSL: {
2560                 sessionlog *sl;
2561                 int size = c->value_int;
2562
2563                 if ( size < 0 ) {
2564                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2565                                 c->argv[0], size );
2566                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2567                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2568                         return ARG_BAD_CONF;
2569                 }
2570                 sl = si->si_logs;
2571                 if ( !sl ) {
2572                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2573                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2574                         sl->sl_mincsn.bv_len = 0;
2575                         sl->sl_num = 0;
2576                         sl->sl_head = sl->sl_tail = NULL;
2577                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2578                         si->si_logs = sl;
2579                 }
2580                 sl->sl_size = size;
2581                 }
2582                 break;
2583         case SP_NOPRES:
2584                 si->si_nopres = c->value_int;
2585                 break;
2586         case SP_USEHINT:
2587                 si->si_usehint = c->value_int;
2588                 break;
2589         }
2590         return rc;
2591 }
2592
2593 /* ITS#3456 we cannot run this search on the main thread, must use a
2594  * child thread in order to insure we have a big enough stack.
2595  */
2596 static void *
2597 syncprov_db_otask(
2598         void *ptr
2599 )
2600 {
2601         syncprov_findcsn( ptr, FIND_MAXCSN );
2602         return NULL;
2603 }
2604
2605 /* Read any existing contextCSN from the underlying db.
2606  * Then search for any entries newer than that. If no value exists,
2607  * just generate it. Cache whatever result.
2608  */
2609 static int
2610 syncprov_db_open(
2611         BackendDB *be,
2612         ConfigReply *cr
2613 )
2614 {
2615         slap_overinst   *on = (slap_overinst *) be->bd_info;
2616         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2617
2618         Connection conn = { 0 };
2619         OperationBuffer opbuf;
2620         Operation *op;
2621         Entry *e = NULL;
2622         Attribute *a;
2623         int rc;
2624         void *thrctx = NULL;
2625
2626         if ( !SLAP_LASTMOD( be )) {
2627                 Debug( LDAP_DEBUG_ANY,
2628                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2629                 return -1;
2630         }
2631
2632         if ( slapMode & SLAP_TOOL_MODE ) {
2633                 return 0;
2634         }
2635
2636         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2637         if ( rc ) {
2638                 return rc;
2639         }
2640
2641         thrctx = ldap_pvt_thread_pool_context();
2642         connection_fake_init( &conn, &opbuf, thrctx );
2643         op = &opbuf.ob_op;
2644         op->o_bd = be;
2645         op->o_dn = be->be_rootdn;
2646         op->o_ndn = be->be_rootndn;
2647
2648         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2649                 slap_schema.si_ad_contextCSN, 0, &e, on );
2650
2651         if ( e ) {
2652                 ldap_pvt_thread_t tid;
2653
2654                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2655                 if ( a ) {
2656                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2657                         si->si_numcsns = a->a_numvals;
2658                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2659                 }
2660                 overlay_entry_release_ov( op, e, 0, on );
2661                 if ( si->si_ctxcsn ) {
2662                         op->o_req_dn = be->be_suffix[0];
2663                         op->o_req_ndn = be->be_nsuffix[0];
2664                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2665                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2666                         ldap_pvt_thread_join( tid, NULL );
2667                 }
2668         }
2669
2670         /* Didn't find a contextCSN, should we generate one? */
2671         if ( !si->si_ctxcsn ) {
2672                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2673                 struct berval csn;
2674
2675                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2676                 /* If we're also a consumer, then don't generate anything.
2677                  * Wait for our provider to send it to us, or for a local
2678                  * modify if we have multimaster.
2679                  */
2680                         goto out;
2681                 }
2682                 csn.bv_val = csnbuf;
2683                 csn.bv_len = sizeof( csnbuf );
2684                 slap_get_csn( op, &csn, 0 );
2685                 value_add_one( &si->si_ctxcsn, &csn );
2686                 si->si_numcsns = 1;
2687                 si->si_sids = ch_malloc( sizeof(int) );
2688                 si->si_sids[0] = slap_serverID;
2689
2690                 /* make sure we do a checkpoint on close */
2691                 si->si_numops++;
2692         }
2693
2694 out:
2695         op->o_bd->bd_info = (BackendInfo *)on;
2696         return 0;
2697 }
2698
2699 /* Write the current contextCSN into the underlying db.
2700  */
2701 static int
2702 syncprov_db_close(
2703         BackendDB *be,
2704         ConfigReply *cr
2705 )
2706 {
2707     slap_overinst   *on = (slap_overinst *) be->bd_info;
2708     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2709
2710         if ( slapMode & SLAP_TOOL_MODE ) {
2711                 return 0;
2712         }
2713         if ( si->si_numops ) {
2714                 Connection conn = {0};
2715                 OperationBuffer opbuf;
2716                 Operation *op;
2717                 SlapReply rs = {REP_RESULT};
2718                 void *thrctx;
2719
2720                 thrctx = ldap_pvt_thread_pool_context();
2721                 connection_fake_init( &conn, &opbuf, thrctx );
2722                 op = &opbuf.ob_op;
2723                 op->o_bd = be;
2724                 op->o_dn = be->be_rootdn;
2725                 op->o_ndn = be->be_rootndn;
2726                 syncprov_checkpoint( op, &rs, on );
2727         }
2728
2729     return 0;
2730 }
2731
2732 static int
2733 syncprov_db_init(
2734         BackendDB *be,
2735         ConfigReply *cr
2736 )
2737 {
2738         slap_overinst   *on = (slap_overinst *)be->bd_info;
2739         syncprov_info_t *si;
2740
2741         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2742                 Debug( LDAP_DEBUG_ANY,
2743                         "syncprov must be instantiated within a database.\n",
2744                         0, 0, 0 );
2745                 return 1;
2746         }
2747
2748         si = ch_calloc(1, sizeof(syncprov_info_t));
2749         on->on_bi.bi_private = si;
2750         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2751         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2752         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2753
2754         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2755         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2756         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2757         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2758
2759         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2760         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2761
2762         return 0;
2763 }
2764
2765 static int
2766 syncprov_db_destroy(
2767         BackendDB *be,
2768         ConfigReply *cr
2769 )
2770 {
2771         slap_overinst   *on = (slap_overinst *)be->bd_info;
2772         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2773
2774         if ( si ) {
2775                 if ( si->si_logs ) {
2776                         slog_entry *se = si->si_logs->sl_head;
2777
2778                         while ( se ) {
2779                                 slog_entry *se_next = se->se_next;
2780                                 ch_free( se );
2781                                 se = se_next;
2782                         }
2783
2784                         ch_free( si->si_logs );
2785                 }
2786                 if ( si->si_ctxcsn )
2787                         ber_bvarray_free( si->si_ctxcsn );
2788                 if ( si->si_sids )
2789                         ch_free( si->si_sids );
2790                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2791                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2792                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2793                 ch_free( si );
2794         }
2795
2796         return 0;
2797 }
2798
2799 static int syncprov_parseCtrl (
2800         Operation *op,
2801         SlapReply *rs,
2802         LDAPControl *ctrl )
2803 {
2804         ber_tag_t tag;
2805         BerElementBuffer berbuf;
2806         BerElement *ber = (BerElement *)&berbuf;
2807         ber_int_t mode;
2808         ber_len_t len;
2809         struct berval cookie = BER_BVNULL;
2810         sync_control *sr;
2811         int rhint = 0;
2812
2813         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2814                 rs->sr_text = "Sync control specified multiple times";
2815                 return LDAP_PROTOCOL_ERROR;
2816         }
2817
2818         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2819                 rs->sr_text = "Sync control specified with pagedResults control";
2820                 return LDAP_PROTOCOL_ERROR;
2821         }
2822
2823         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
2824                 rs->sr_text = "Sync control value is absent";
2825                 return LDAP_PROTOCOL_ERROR;
2826         }
2827
2828         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2829                 rs->sr_text = "Sync control value is empty";
2830                 return LDAP_PROTOCOL_ERROR;
2831         }
2832
2833         /* Parse the control value
2834          *      syncRequestValue ::= SEQUENCE {
2835          *              mode   ENUMERATED {
2836          *                      -- 0 unused
2837          *                      refreshOnly             (1),
2838          *                      -- 2 reserved
2839          *                      refreshAndPersist       (3)
2840          *              },
2841          *              cookie  syncCookie OPTIONAL
2842          *      }
2843          */
2844
2845         ber_init2( ber, &ctrl->ldctl_value, 0 );
2846
2847         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2848                 rs->sr_text = "Sync control : mode decoding error";
2849                 return LDAP_PROTOCOL_ERROR;
2850         }
2851
2852         switch( mode ) {
2853         case LDAP_SYNC_REFRESH_ONLY:
2854                 mode = SLAP_SYNC_REFRESH;
2855                 break;
2856         case LDAP_SYNC_REFRESH_AND_PERSIST:
2857                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2858                 break;
2859         default:
2860                 rs->sr_text = "Sync control : unknown update mode";
2861                 return LDAP_PROTOCOL_ERROR;
2862         }
2863
2864         tag = ber_peek_tag( ber, &len );
2865
2866         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2867                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2868                         rs->sr_text = "Sync control : cookie decoding error";
2869                         return LDAP_PROTOCOL_ERROR;
2870                 }
2871                 tag = ber_peek_tag( ber, &len );
2872         }
2873         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2874                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2875                         rs->sr_text = "Sync control : rhint decoding error";
2876                         return LDAP_PROTOCOL_ERROR;
2877                 }
2878         }
2879         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2880                         rs->sr_text = "Sync control : decoding error";
2881                         return LDAP_PROTOCOL_ERROR;
2882         }
2883         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2884         sr->sr_rhint = rhint;
2885         if (!BER_BVISNULL(&cookie)) {
2886                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2887                 /* If parse fails, pretend no cookie was sent */
2888                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
2889                         sr->sr_state.rid == -1 ) {
2890                         if ( sr->sr_state.ctxcsn ) {
2891                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
2892                                 sr->sr_state.ctxcsn = NULL;
2893                         }
2894                         sr->sr_state.numcsns = 0;
2895                 }
2896         }
2897
2898         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2899
2900         op->o_sync = ctrl->ldctl_iscritical
2901                 ? SLAP_CONTROL_CRITICAL
2902                 : SLAP_CONTROL_NONCRITICAL;
2903
2904         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2905
2906         return LDAP_SUCCESS;
2907 }
2908
2909 /* This overlay is set up for dynamic loading via moduleload. For static
2910  * configuration, you'll need to arrange for the slap_overinst to be
2911  * initialized and registered by some other function inside slapd.
2912  */
2913
2914 static slap_overinst            syncprov;
2915
2916 int
2917 syncprov_initialize()
2918 {
2919         int rc;
2920
2921         rc = register_supported_control( LDAP_CONTROL_SYNC,
2922                 SLAP_CTRL_SEARCH, NULL,
2923                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2924         if ( rc != LDAP_SUCCESS ) {
2925                 Debug( LDAP_DEBUG_ANY,
2926                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2927                 return rc;
2928         }
2929
2930         syncprov.on_bi.bi_type = "syncprov";
2931         syncprov.on_bi.bi_db_init = syncprov_db_init;
2932         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2933         syncprov.on_bi.bi_db_open = syncprov_db_open;
2934         syncprov.on_bi.bi_db_close = syncprov_db_close;
2935
2936         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2937         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2938
2939         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2940         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2941         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2942         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2943         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2944         syncprov.on_bi.bi_op_search = syncprov_op_search;
2945         syncprov.on_bi.bi_extended = syncprov_op_extended;
2946         syncprov.on_bi.bi_operational = syncprov_operational;
2947
2948         syncprov.on_bi.bi_cf_ocs = spocs;
2949
2950         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2951
2952         rc = config_register_schema( spcfg, spocs );
2953         if ( rc ) return rc;
2954
2955         return overlay_register( &syncprov );
2956 }
2957
2958 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2959 int
2960 init_module( int argc, char *argv[] )
2961 {
2962         return syncprov_initialize();
2963 }
2964 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2965
2966 #endif /* defined(SLAPD_OVER_SYNCPROV) */