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 2004-2005 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
  29 /* A modify request on a particular entry */
  30 typedef struct modinst {
  31         struct modinst *mi_next;
  32         Operation *mi_op;
  33 } modinst;
  34
  35 typedef struct modtarget {
  36         struct modinst *mt_mods;
  37         struct modinst *mt_tail;
  38         Operation *mt_op;
  39         ldap_pvt_thread_mutex_t mt_mutex;
  40 } modtarget;
  41
  42 /* A queued result of a persistent search */
  43 typedef struct syncres {
  44         struct syncres *s_next;
  45         struct berval s_dn;
  46         struct berval s_ndn;
  47         struct berval s_uuid;
  48         struct berval s_csn;
  49         char s_mode;
  50         char s_isreference;
  51 } syncres;
  52
  53 /* Record of a persistent search */
  54 typedef struct syncops {
  55         struct syncops *s_next;
  56         struct berval   s_base;         /* ndn of search base */
  57         ID              s_eid;          /* entryID of search base */
  58         Operation       *s_op;          /* search op */
  59         int             s_rid;
  60         struct berval s_filterstr;
  61         int             s_flags;        /* search status */
  62         int             s_inuse;        /* reference count */
  63         struct syncres *s_res;
  64         struct syncres *s_restail;
  65         ldap_pvt_thread_mutex_t s_mutex;
  66 } syncops;
  67
  68 /* A received sync control */
  69 typedef struct sync_control {
  70         struct sync_cookie sr_state;
  71         int sr_rhint;
  72 } sync_control;
  73
  74 #if 0 /* moved back to slap.h */
  75 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  76 #endif
  77 /* o_sync_mode uses data bits of o_sync */
  78 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  79
  80 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  81 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  82 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  83 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  84
  85 #define PS_IS_REFRESHING        0x01
  86 #define PS_IS_DETACHED          0x02
  87
  88 /* Record of which searches matched at premodify step */
  89 typedef struct syncmatches {
  90         struct syncmatches *sm_next;
  91         syncops *sm_op;
  92 } syncmatches;
  93
  94 /* Session log data */
  95 typedef struct slog_entry {
  96         struct slog_entry *se_next;
  97         struct berval se_uuid;
  98         struct berval se_csn;
  99         ber_tag_t       se_tag;
 100 } slog_entry;
 101
 102 typedef struct sessionlog {
 103         struct berval   sl_mincsn;
 104         int             sl_num;
 105         int             sl_size;
 106         slog_entry *sl_head;
 107         slog_entry *sl_tail;
 108         ldap_pvt_thread_mutex_t sl_mutex;
 109 } sessionlog;
 110
 111 /* The main state for this overlay */
 112 typedef struct syncprov_info_t {
 113         syncops         *si_ops;
 114         struct berval   si_ctxcsn;      /* ldapsync context */
 115         int             si_chkops;      /* checkpointing info */
 116         int             si_chktime;
 117         int             si_numops;      /* number of ops since last checkpoint */
 118         time_t  si_chklast;     /* time of last checkpoint */
 119         Avlnode *si_mods;       /* entries being modified */
 120         sessionlog      *si_logs;
 121         ldap_pvt_thread_mutex_t si_csn_mutex;
 122         ldap_pvt_thread_mutex_t si_ops_mutex;
 123         ldap_pvt_thread_mutex_t si_mods_mutex;
 124         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 125 } syncprov_info_t;
 126
 127 typedef struct opcookie {
 128         slap_overinst *son;
 129         syncmatches *smatches;
 130         struct berval sdn;      /* DN of entry, for deletes */
 131         struct berval sndn;
 132         struct berval suuid;    /* UUID of entry */
 133         struct berval sctxcsn;
 134         int sreference; /* Is the entry a reference? */
 135 } opcookie;
 136
 137 typedef struct fbase_cookie {
 138         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 139         syncops *fss;   /* persistent search we're testing against */
 140         int fbase;      /* if TRUE we found the search base and it's still valid */
 141         int fscope;     /* if TRUE then fdn is within the psearch scope */
 142 } fbase_cookie;
 143
 144 static AttributeName csn_anlist[2];
 145 static AttributeName uuid_anlist[2];
 146
 147 /* Build a LDAPsync intermediate state control */
 148 static int
 149 syncprov_state_ctrl(
 150         Operation       *op,
 151         SlapReply       *rs,
 152         Entry           *e,
 153         int             entry_sync_state,
 154         LDAPControl     **ctrls,
 155         int             num_ctrls,
 156         int             send_cookie,
 157         struct berval   *cookie )
 158 {
 159         Attribute* a;
 160         int ret;
 161         int res;
 162         const char *text = NULL;
 163
 164         BerElementBuffer berbuf;
 165         BerElement *ber = (BerElement *)&berbuf;
 166
 167         struct berval   entryuuid_bv = BER_BVNULL;
 168
 169         ber_init2( ber, 0, LBER_USE_DER );
 170         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 171
 172         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 173
 174         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 175                 AttributeDescription *desc = a->a_desc;
 176                 if ( desc == slap_schema.si_ad_entryUUID ) {
 177                         entryuuid_bv = a->a_nvals[0];
 178                         break;
 179                 }
 180         }
 181
 182         if ( send_cookie && cookie ) {
 183                 ber_printf( ber, "{eOON}",
 184                         entry_sync_state, &entryuuid_bv, cookie );
 185         } else {
 186                 ber_printf( ber, "{eON}",
 187                         entry_sync_state, &entryuuid_bv );
 188         }
 189
 190         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 191         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 192         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 193
 194         ber_free_buf( ber );
 195
 196         if ( ret < 0 ) {
 197                 Debug( LDAP_DEBUG_TRACE,
 198                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 199                         0, 0, 0 );
 200                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 201                 return ret;
 202         }
 203
 204         return LDAP_SUCCESS;
 205 }
 206
 207 /* Build a LDAPsync final state control */
 208 static int
 209 syncprov_done_ctrl(
 210         Operation       *op,
 211         SlapReply       *rs,
 212         LDAPControl     **ctrls,
 213         int                     num_ctrls,
 214         int                     send_cookie,
 215         struct berval *cookie,
 216         int                     refreshDeletes )
 217 {
 218         int ret;
 219         BerElementBuffer berbuf;
 220         BerElement *ber = (BerElement *)&berbuf;
 221
 222         ber_init2( ber, NULL, LBER_USE_DER );
 223         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 224
 225         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 226
 227         ber_printf( ber, "{" );
 228         if ( send_cookie && cookie ) {
 229                 ber_printf( ber, "O", cookie );
 230         }
 231         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 232                 ber_printf( ber, "b", refreshDeletes );
 233         }
 234         ber_printf( ber, "N}" );
 235
 236         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 237         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 238         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 239
 240         ber_free_buf( ber );
 241
 242         if ( ret < 0 ) {
 243                 Debug( LDAP_DEBUG_TRACE,
 244                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 245                         0, 0, 0 );
 246                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 247                 return ret;
 248         }
 249
 250         return LDAP_SUCCESS;
 251 }
 252
 253 static int
 254 syncprov_sendinfo(
 255         Operation       *op,
 256         SlapReply       *rs,
 257         int                     type,
 258         struct berval *cookie,
 259         int                     refreshDone,
 260         BerVarray       syncUUIDs,
 261         int                     refreshDeletes )
 262 {
 263         BerElementBuffer berbuf;
 264         BerElement *ber = (BerElement *)&berbuf;
 265         struct berval rspdata;
 266
 267         int ret;
 268
 269         ber_init2( ber, NULL, LBER_USE_DER );
 270         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 271
 272         if ( type ) {
 273                 switch ( type ) {
 274                 case LDAP_TAG_SYNC_NEW_COOKIE:
 275                         ber_printf( ber, "tO", type, cookie );
 276                         break;
 277                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 278                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 279                         ber_printf( ber, "t{", type );
 280                         if ( cookie ) {
 281                                 ber_printf( ber, "O", cookie );
 282                         }
 283                         if ( refreshDone == 0 ) {
 284                                 ber_printf( ber, "b", refreshDone );
 285                         }
 286                         ber_printf( ber, "N}" );
 287                         break;
 288                 case LDAP_TAG_SYNC_ID_SET:
 289                         ber_printf( ber, "t{", type );
 290                         if ( cookie ) {
 291                                 ber_printf( ber, "O", cookie );
 292                         }
 293                         if ( refreshDeletes == 1 ) {
 294                                 ber_printf( ber, "b", refreshDeletes );
 295                         }
 296                         ber_printf( ber, "[W]", syncUUIDs );
 297                         ber_printf( ber, "N}" );
 298                         break;
 299                 default:
 300                         Debug( LDAP_DEBUG_TRACE,
 301                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 302                                 type, 0, 0 );
 303                         return LDAP_OTHER;
 304                 }
 305         }
 306
 307         ret = ber_flatten2( ber, &rspdata, 0 );
 308
 309         if ( ret < 0 ) {
 310                 Debug( LDAP_DEBUG_TRACE,
 311                         "syncprov_sendinfo: ber_flatten2 failed\n",
 312                         0, 0, 0 );
 313                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 314                 return ret;
 315         }
 316
 317         rs->sr_rspoid = LDAP_SYNC_INFO;
 318         rs->sr_rspdata = &rspdata;
 319         send_ldap_intermediate( op, rs );
 320         rs->sr_rspdata = NULL;
 321         ber_free_buf( ber );
 322
 323         return LDAP_SUCCESS;
 324 }
 325
 326 /* Find a modtarget in an AVL tree */
 327 static int
 328 sp_avl_cmp( const void *c1, const void *c2 )
 329 {
 330         const modtarget *m1, *m2;
 331         int rc;
 332
 333         m1 = c1; m2 = c2;
 334         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 335
 336         if ( rc ) return rc;
 337         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 338 }
 339
 340 /* syncprov_findbase:
 341  *   finds the true DN of the base of a search (with alias dereferencing) and
 342  * checks to make sure the base entry doesn't get replaced with a different
 343  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 344  * change is detected, any persistent search on this base must be terminated /
 345  * reloaded.
 346  *   On the first call, we just save the DN and entryID. On subsequent calls
 347  * we compare the DN and entryID with the saved values.
 348  */
 349 static int
 350 findbase_cb( Operation *op, SlapReply *rs )
 351 {
 352         slap_callback *sc = op->o_callback;
 353
 354         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 355                 fbase_cookie *fc = sc->sc_private;
 356
 357                 /* If no entryID, we're looking for the first time.
 358                  * Just store whatever we got.
 359                  */
 360                 if ( fc->fss->s_eid == NOID ) {
 361                         fc->fbase = 1;
 362                         fc->fss->s_eid = rs->sr_entry->e_id;
 363                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 364
 365                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 366                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 367
 368                 /* OK, the DN is the same and the entryID is the same. Now
 369                  * see if the fdn resides in the scope.
 370                  */
 371                         fc->fbase = 1;
 372                         switch ( fc->fss->s_op->ors_scope ) {
 373                         case LDAP_SCOPE_BASE:
 374                                 fc->fscope = dn_match( fc->fdn, &rs->sr_entry->e_nname );
 375                                 break;
 376                         case LDAP_SCOPE_ONELEVEL: {
 377                                 struct berval pdn;
 378                                 dnParent( fc->fdn, &pdn );
 379                                 fc->fscope = dn_match( &pdn, &rs->sr_entry->e_nname );
 380                                 break; }
 381                         case LDAP_SCOPE_SUBTREE:
 382                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname );
 383                                 break;
 384 #ifdef LDAP_SCOPE_SUBORDINATE
 385                         case LDAP_SCOPE_SUBORDINATE:
 386                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname ) &&
 387                                         !dn_match( fc->fdn, &rs->sr_entry->e_nname );
 388                                 break;
 389 #endif
 390                         }
 391                 }
 392         }
 393         if ( rs->sr_err != LDAP_SUCCESS ) {
 394                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 395         }
 396         return LDAP_SUCCESS;
 397 }
 398
 399 static int
 400 syncprov_findbase( Operation *op, fbase_cookie *fc )
 401 {
 402         opcookie *opc = op->o_callback->sc_private;
 403         slap_overinst *on = opc->son;
 404         syncprov_info_t         *si = on->on_bi.bi_private;
 405
 406         slap_callback cb = {0};
 407         Operation fop;
 408         SlapReply frs = { REP_RESULT };
 409         int rc;
 410
 411         fop = *op;
 412
 413         cb.sc_response = findbase_cb;
 414         cb.sc_private = fc;
 415
 416         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync mode */
 417         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 418         fop.o_callback = &cb;
 419         fop.o_tag = LDAP_REQ_SEARCH;
 420         fop.ors_scope = LDAP_SCOPE_BASE;
 421         fop.ors_deref = fc->fss->s_op->ors_deref;
 422         fop.ors_limit = NULL;
 423         fop.ors_slimit = 1;
 424         fop.ors_tlimit = SLAP_NO_LIMIT;
 425         fop.ors_attrs = slap_anlist_no_attrs;
 426         fop.ors_attrsonly = 1;
 427         fop.ors_filter = fc->fss->s_op->ors_filter;
 428         fop.ors_filterstr = fc->fss->s_op->ors_filterstr;
 429
 430         fop.o_req_ndn = fc->fss->s_op->o_req_ndn;
 431
 432         fop.o_bd->bd_info = on->on_info->oi_orig;
 433         rc = fop.o_bd->be_search( &fop, &frs );
 434         fop.o_bd->bd_info = (BackendInfo *)on;
 435
 436         if ( fc->fbase ) return LDAP_SUCCESS;
 437
 438         /* If entryID has changed, then the base of this search has
 439          * changed. Invalidate the psearch.
 440          */
 441         return LDAP_NO_SUCH_OBJECT;
 442 }
 443
 444 /* syncprov_findcsn:
 445  *   This function has three different purposes, but they all use a search
 446  * that filters on entryCSN so they're combined here.
 447  * 1: at startup time, after a contextCSN has been read from the database,
 448  * we search for all entries with CSN >= contextCSN in case the contextCSN
 449  * was not checkpointed at the previous shutdown.
 450  *
 451  * 2: when the current contextCSN is known and we have a sync cookie, we search
 452  * for one entry with CSN <= the cookie CSN. (Used to search for =.) If an
 453  * entry is found, the cookie CSN is valid, otherwise it is stale.
 454  *
 455  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 456  * CSN, and generate Present records for them. We always collect this result
 457  * in SyncID sets, even if there's only one match.
 458  */
 459 #define FIND_MAXCSN     1
 460 #define FIND_CSN        2
 461 #define FIND_PRESENT    3
 462
 463 static int
 464 findmax_cb( Operation *op, SlapReply *rs )
 465 {
 466         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 467                 struct berval *maxcsn = op->o_callback->sc_private;
 468                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 469                         slap_schema.si_ad_entryCSN );
 470
 471                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 472                         maxcsn->bv_len = a->a_vals[0].bv_len;
 473                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 474                 }
 475         }
 476         return LDAP_SUCCESS;
 477 }
 478
 479 static int
 480 findcsn_cb( Operation *op, SlapReply *rs )
 481 {
 482         slap_callback *sc = op->o_callback;
 483
 484         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 485                 sc->sc_private = (void *)1;
 486         }
 487         return LDAP_SUCCESS;
 488 }
 489
 490 /* Build a list of entryUUIDs for sending in a SyncID set */
 491
 492 #define UUID_LEN        16
 493
 494 typedef struct fpres_cookie {
 495         int num;
 496         BerVarray uuids;
 497         char *last;
 498 } fpres_cookie;
 499
 500 static int
 501 findpres_cb( Operation *op, SlapReply *rs )
 502 {
 503         slap_callback *sc = op->o_callback;
 504         fpres_cookie *pc = sc->sc_private;
 505         Attribute *a;
 506         int ret = SLAP_CB_CONTINUE;
 507
 508         switch ( rs->sr_type ) {
 509         case REP_SEARCH:
 510                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 511                 if ( a ) {
 512                         pc->uuids[pc->num].bv_val = pc->last;
 513                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 514                                 pc->uuids[pc->num].bv_len );
 515                         pc->num++;
 516                         pc->last = pc->uuids[pc->num].bv_val;
 517                         pc->uuids[pc->num].bv_val = NULL;
 518                 }
 519                 ret = LDAP_SUCCESS;
 520                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 521                         break;
 522                 /* FALLTHRU */
 523         case REP_RESULT:
 524                 ret = rs->sr_err;
 525                 if ( pc->num ) {
 526                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 527                                 0, pc->uuids, 0 );
 528                         pc->uuids[pc->num].bv_val = pc->last;
 529                         pc->num = 0;
 530                         pc->last = pc->uuids[0].bv_val;
 531                 }
 532                 break;
 533         default:
 534                 break;
 535         }
 536         return ret;
 537 }
 538
 539 static int
 540 syncprov_findcsn( Operation *op, int mode )
 541 {
 542         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 543         syncprov_info_t         *si = on->on_bi.bi_private;
 544
 545         slap_callback cb = {0};
 546         Operation fop;
 547         SlapReply frs = { REP_RESULT };
 548         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 549         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 550         struct berval fbuf, maxcsn;
 551         Filter cf, af;
 552 #ifdef LDAP_COMP_MATCH
 553         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 554 #else
 555         AttributeAssertion eq = { NULL, BER_BVNULL };
 556 #endif
 557         int i, rc = LDAP_SUCCESS;
 558         fpres_cookie pcookie;
 559         sync_control *srs = NULL;
 560
 561         if ( mode != FIND_MAXCSN ) {
 562                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 563
 564                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 565                         return LDAP_OTHER;
 566                 }
 567         }
 568
 569         fop = *op;
 570         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 571         /* We want pure entries, not referrals */
 572         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 573
 574         fbuf.bv_val = buf;
 575         cf.f_ava = &eq;
 576         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 577         cf.f_next = NULL;
 578
 579         fop.o_callback = &cb;
 580         fop.ors_limit = NULL;
 581         fop.ors_tlimit = SLAP_NO_LIMIT;
 582         fop.ors_filter = &cf;
 583         fop.ors_filterstr = fbuf;
 584
 585         switch( mode ) {
 586         case FIND_MAXCSN:
 587                 cf.f_choice = LDAP_FILTER_GE;
 588                 cf.f_av_value = si->si_ctxcsn;
 589                 fbuf.bv_len = sprintf( buf, "(entryCSN>=%s)",
 590                         cf.f_av_value.bv_val );
 591                 fop.ors_attrsonly = 0;
 592                 fop.ors_attrs = csn_anlist;
 593                 fop.ors_slimit = SLAP_NO_LIMIT;
 594                 cb.sc_private = &maxcsn;
 595                 cb.sc_response = findmax_cb;
 596                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 597                 maxcsn.bv_val = cbuf;
 598                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 599                 break;
 600         case FIND_CSN:
 601                 cf.f_choice = LDAP_FILTER_LE;
 602                 cf.f_av_value = srs->sr_state.ctxcsn;
 603                 fbuf.bv_len = sprintf( buf, "(entryCSN<=%s)",
 604                         cf.f_av_value.bv_val );
 605                 fop.ors_attrsonly = 1;
 606                 fop.ors_attrs = slap_anlist_no_attrs;
 607                 fop.ors_slimit = 1;
 608                 cb.sc_private = NULL;
 609                 cb.sc_response = findcsn_cb;
 610                 break;
 611         case FIND_PRESENT:
 612                 af.f_choice = LDAP_FILTER_AND;
 613                 af.f_next = NULL;
 614                 af.f_and = &cf;
 615                 cf.f_choice = LDAP_FILTER_LE;
 616                 cf.f_av_value = srs->sr_state.ctxcsn;
 617                 cf.f_next = op->ors_filter;
 618                 fop.ors_filter = &af;
 619                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 620                 fop.ors_attrsonly = 0;
 621                 fop.ors_attrs = uuid_anlist;
 622                 fop.ors_slimit = SLAP_NO_LIMIT;
 623                 cb.sc_private = &pcookie;
 624                 cb.sc_response = findpres_cb;
 625                 pcookie.num = 0;
 626
 627                 /* preallocate storage for a full set */
 628                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 629                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 630                         op->o_tmpmemctx );
 631                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 632                 pcookie.uuids[0].bv_val = pcookie.last;
 633                 pcookie.uuids[0].bv_len = UUID_LEN;
 634                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 635                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 636                         pcookie.uuids[i].bv_len = UUID_LEN;
 637                 }
 638                 break;
 639         }
 640
 641         fop.o_bd->bd_info = on->on_info->oi_orig;
 642         fop.o_bd->be_search( &fop, &frs );
 643         fop.o_bd->bd_info = (BackendInfo *)on;
 644
 645         switch( mode ) {
 646         case FIND_MAXCSN:
 647                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 648                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 649                 break;
 650         case FIND_CSN:
 651                 /* If matching CSN was not found, invalidate the context. */
 652                 if ( !cb.sc_private ) rc = LDAP_NO_SUCH_OBJECT;
 653                 break;
 654         case FIND_PRESENT:
 655                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 656                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 657                 break;
 658         }
 659
 660         return rc;
 661 }
 662
 663 /* Queue a persistent search response */
 664 static int
 665 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 666 {
 667         syncres *sr;
 668
 669         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 670                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 671         sr->s_next = NULL;
 672         sr->s_dn.bv_val = (char *)(sr + 1);
 673         sr->s_dn.bv_len = opc->sdn.bv_len;
 674         sr->s_mode = mode;
 675         sr->s_isreference = opc->sreference;
 676         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 677         sr->s_ndn.bv_len = opc->sndn.bv_len;
 678         *(sr->s_ndn.bv_val++) = '\0';
 679         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 680         sr->s_uuid.bv_len = opc->suuid.bv_len;
 681         *(sr->s_uuid.bv_val++) = '\0';
 682         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 683         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 684         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 685
 686         if ( !so->s_res ) {
 687                 so->s_res = sr;
 688         } else {
 689                 so->s_restail->s_next = sr;
 690         }
 691         so->s_restail = sr;
 692         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 693         return LDAP_SUCCESS;
 694 }
 695
 696 /* Play back queued responses */
 697 static int
 698 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode, int queue );
 699
 700 static int
 701 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 702 {
 703         syncres *sr, *srnext;
 704         Entry *e;
 705         opcookie opc;
 706         int rc;
 707
 708         opc.son = on;
 709         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 710         for (sr = so->s_res; sr; sr=srnext) {
 711                 int rc;
 712                 srnext = sr->s_next;
 713                 opc.sdn = sr->s_dn;
 714                 opc.sndn = sr->s_ndn;
 715                 opc.suuid = sr->s_uuid;
 716                 opc.sctxcsn = sr->s_csn;
 717                 opc.sreference = sr->s_isreference;
 718                 e = NULL;
 719
 720                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 721                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 722                         if ( rc ) {
 723                                 ch_free( sr );
 724                                 so->s_res = srnext;
 725                                 continue;
 726                         }
 727                 }
 728                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode, 0 );
 729
 730                 if ( e ) {
 731                         be_entry_release_rw( op, e, 0 );
 732                 }
 733                 if ( rc )
 734                         break;
 735
 736                 ch_free( sr );
 737                 so->s_res = srnext;
 738         }
 739         op->o_bd->bd_info = (BackendInfo *)on;
 740         if ( !so->s_res )
 741                 so->s_restail = NULL;
 742         return rc;
 743 }
 744
 745 /* Send a persistent search response */
 746 static int
 747 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode, int queue )
 748 {
 749         slap_overinst *on = opc->son;
 750         syncprov_info_t *si = on->on_bi.bi_private;
 751
 752         SlapReply rs = { REP_SEARCH };
 753         LDAPControl *ctrls[2];
 754         struct berval cookie;
 755         Entry e_uuid = {0};
 756         Attribute a_uuid = {0};
 757         Operation sop = *so->s_op;
 758         Opheader ohdr;
 759
 760         ohdr = *sop.o_hdr;
 761         sop.o_hdr = &ohdr;
 762         sop.o_tmpmemctx = op->o_tmpmemctx;
 763         sop.o_bd = op->o_bd;
 764         sop.o_controls = op->o_controls;
 765         sop.o_private = op->o_private;
 766
 767         /* If queueing is allowed */
 768         if ( queue ) {
 769                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 770                 /* If we're still in refresh mode, must queue */
 771                 if (so->s_flags & PS_IS_REFRESHING) {
 772                         return syncprov_qresp( opc, so, mode );
 773                 }
 774                 /* If connection is free but queue is non-empty,
 775                  * try to flush the queue.
 776                  */
 777                 if ( so->s_res ) {
 778                         rs.sr_err = syncprov_qplay( &sop, on, so );
 779                 }
 780                 /* If the connection is busy, must queue */
 781                 if ( sop.o_conn->c_writewaiter || rs.sr_err == LDAP_BUSY ) {
 782                         return syncprov_qresp( opc, so, mode );
 783                 }
 784                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 785         } else {
 786                 /* Queueing not allowed and conn is busy, give up */
 787                 if ( sop.o_conn->c_writewaiter )
 788                         return LDAP_BUSY;
 789         }
 790
 791         ctrls[1] = NULL;
 792         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 793
 794         e_uuid.e_attrs = &a_uuid;
 795         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 796         a_uuid.a_nvals = &opc->suuid;
 797         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 798                 mode, ctrls, 0, 1, &cookie );
 799
 800         rs.sr_ctrls = ctrls;
 801         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 802         switch( mode ) {
 803         case LDAP_SYNC_ADD:
 804                 rs.sr_entry = *e;
 805                 if ( rs.sr_entry->e_private )
 806                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 807                 if ( opc->sreference ) {
 808                         rs.sr_ref = get_entry_referrals( &sop, rs.sr_entry );
 809                         send_search_reference( &sop, &rs );
 810                         ber_bvarray_free( rs.sr_ref );
 811                         if ( !rs.sr_entry )
 812                                 *e = NULL;
 813                         break;
 814                 }
 815                 /* fallthru */
 816         case LDAP_SYNC_MODIFY:
 817                 rs.sr_entry = *e;
 818                 if ( rs.sr_entry->e_private )
 819                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 820                 rs.sr_attrs = sop.ors_attrs;
 821                 send_search_entry( &sop, &rs );
 822                 if ( !rs.sr_entry )
 823                         *e = NULL;
 824                 break;
 825         case LDAP_SYNC_DELETE:
 826                 e_uuid.e_attrs = NULL;
 827                 e_uuid.e_name = opc->sdn;
 828                 e_uuid.e_nname = opc->sndn;
 829                 rs.sr_entry = &e_uuid;
 830                 if ( opc->sreference ) {
 831                         struct berval bv = BER_BVNULL;
 832                         rs.sr_ref = &bv;
 833                         send_search_reference( &sop, &rs );
 834                 } else {
 835                         send_search_entry( &sop, &rs );
 836                 }
 837                 break;
 838         default:
 839                 assert(0);
 840         }
 841         op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 842         op->o_private = sop.o_private;
 843         rs.sr_ctrls = NULL;
 844         /* Check queue again here; if we were hanging in a send and eventually
 845          * recovered, there may be more to send now.
 846          */
 847         if ( rs.sr_err == LDAP_SUCCESS && queue && so->s_res ) {
 848                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 849                 rs.sr_err = syncprov_qplay( &sop, on, so );
 850                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 851         }
 852         return rs.sr_err;
 853 }
 854
 855 static void
 856 syncprov_free_syncop( syncops *so )
 857 {
 858         syncres *sr, *srnext;
 859         GroupAssertion *ga, *gnext;
 860
 861         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 862         so->s_inuse--;
 863         if ( so->s_inuse > 0 ) {
 864                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 865                 return;
 866         }
 867         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 868         if ( so->s_flags & PS_IS_DETACHED ) {
 869                 filter_free( so->s_op->ors_filter );
 870                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 871                         gnext = ga->ga_next;
 872                         ch_free( ga );
 873                 }
 874                 ch_free( so->s_op );
 875         }
 876         ch_free( so->s_base.bv_val );
 877         for ( sr=so->s_res; sr; sr=srnext ) {
 878                 srnext = sr->s_next;
 879                 ch_free( sr );
 880         }
 881         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 882         ch_free( so );
 883 }
 884
 885 static int
 886 syncprov_drop_psearch( syncops *so, int lock )
 887 {
 888         if ( so->s_flags & PS_IS_DETACHED ) {
 889                 if ( lock )
 890                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 891                 so->s_op->o_conn->c_n_ops_executing--;
 892                 so->s_op->o_conn->c_n_ops_completed++;
 893                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 894                         o_next );
 895                 if ( lock )
 896                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 897         }
 898         syncprov_free_syncop( so );
 899
 900         return 0;
 901 }
 902
 903 static int
 904 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 905 {
 906         slap_callback *sc = op->o_callback;
 907         op->o_callback = sc->sc_next;
 908         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 909         op->o_tmpfree( sc, op->o_tmpmemctx );
 910         return 0;
 911 }
 912
 913 static int
 914 syncprov_op_abandon( Operation *op, SlapReply *rs )
 915 {
 916         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 917         syncprov_info_t         *si = on->on_bi.bi_private;
 918         syncops *so, *soprev;
 919
 920         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 921         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 922                 soprev=so, so=so->s_next ) {
 923                 if ( so->s_op->o_connid == op->o_connid &&
 924                         so->s_op->o_msgid == op->orn_msgid ) {
 925                                 so->s_op->o_abandon = 1;
 926                                 soprev->s_next = so->s_next;
 927                                 break;
 928                 }
 929         }
 930         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 931         if ( so ) {
 932                 /* Is this really a Cancel exop? */
 933                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 934                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
 935                         rs->sr_err = LDAP_CANCELLED;
 936                         send_ldap_result( so->s_op, rs );
 937                         if ( so->s_flags & PS_IS_DETACHED ) {
 938                                 slap_callback *cb;
 939                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
 940                                 cb->sc_cleanup = syncprov_ab_cleanup;
 941                                 cb->sc_next = op->o_callback;
 942                                 cb->sc_private = so;
 943                                 return SLAP_CB_CONTINUE;
 944                         }
 945                 }
 946                 syncprov_drop_psearch( so, 0 );
 947         }
 948         return SLAP_CB_CONTINUE;
 949 }
 950
 951 /* Find which persistent searches are affected by this operation */
 952 static void
 953 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 954 {
 955         slap_overinst *on = opc->son;
 956         syncprov_info_t         *si = on->on_bi.bi_private;
 957
 958         fbase_cookie fc;
 959         syncops *ss, *sprev, *snext;
 960         Entry *e;
 961         Attribute *a;
 962         int rc;
 963         struct berval newdn;
 964         int freefdn = 0;
 965
 966         fc.fdn = &op->o_req_ndn;
 967         /* compute new DN */
 968         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 969                 struct berval pdn;
 970                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 971                 else dnParent( fc.fdn, &pdn );
 972                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
 973                 fc.fdn = &newdn;
 974                 freefdn = 1;
 975         }
 976         if ( op->o_tag != LDAP_REQ_ADD ) {
 977                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 978                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
 979                 op->o_bd->bd_info = (BackendInfo *)on;
 980                 if ( rc ) return;
 981         } else {
 982                 e = op->ora_e;
 983         }
 984
 985         if ( saveit ) {
 986                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
 987                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
 988                 opc->sreference = is_entry_referral( e );
 989         }
 990         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
 991                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
 992                 if ( a )
 993                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
 994         }
 995
 996         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 997         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
 998                 sprev = ss, ss=snext)
 999         {
1000                 syncmatches *sm;
1001                 int found = 0;
1002
1003                 snext = ss->s_next;
1004                 /* validate base */
1005                 fc.fss = ss;
1006                 fc.fbase = 0;
1007                 fc.fscope = 0;
1008
1009                 /* If the base of the search is missing, signal a refresh */
1010                 rc = syncprov_findbase( op, &fc );
1011                 if ( rc != LDAP_SUCCESS ) {
1012                         SlapReply rs = {REP_RESULT};
1013                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1014                                 "search base has changed" );
1015                         sprev->s_next = snext;
1016                         syncprov_drop_psearch( ss, 1 );
1017                         continue;
1018                 }
1019
1020                 /* If we're sending results now, look for this op in old matches */
1021                 if ( !saveit ) {
1022                         syncmatches *old;
1023                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1024                                 old=sm, sm=sm->sm_next ) {
1025                                 if ( sm->sm_op == ss ) {
1026                                         found = 1;
1027                                         old->sm_next = sm->sm_next;
1028                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1029                                         break;
1030                                 }
1031                         }
1032                 }
1033
1034                 /* check if current o_req_dn is in scope and matches filter */
1035                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1036                         LDAP_COMPARE_TRUE ) {
1037                         if ( saveit ) {
1038                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1039                                 sm->sm_next = opc->smatches;
1040                                 sm->sm_op = ss;
1041                                 ss->s_inuse++;
1042                                 opc->smatches = sm;
1043                         } else {
1044                                 /* if found send UPDATE else send ADD */
1045                                 ss->s_inuse++;
1046                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1047                                 syncprov_sendresp( op, opc, ss, &e,
1048                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
1049                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1050                                 ss->s_inuse--;
1051                         }
1052                 } else if ( !saveit && found ) {
1053                         /* send DELETE */
1054                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1055                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
1056                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1057                 }
1058         }
1059         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1060 done:
1061         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1062                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1063                 be_entry_release_rw( op, e, 0 );
1064                 op->o_bd->bd_info = (BackendInfo *)on;
1065         }
1066         if ( freefdn ) {
1067                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1068         }
1069 }
1070
1071 static int
1072 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1073 {
1074         slap_callback *cb = op->o_callback;
1075         opcookie *opc = cb->sc_private;
1076         slap_overinst *on = opc->son;
1077         syncprov_info_t         *si = on->on_bi.bi_private;
1078         syncmatches *sm, *snext;
1079         modtarget *mt, mtdummy;
1080
1081         for (sm = opc->smatches; sm; sm=snext) {
1082                 snext = sm->sm_next;
1083                 syncprov_free_syncop( sm->sm_op );
1084                 op->o_tmpfree( sm, op->o_tmpmemctx );
1085         }
1086
1087         /* Remove op from lock table */
1088         mtdummy.mt_op = op;
1089         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1090         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1091         if ( mt ) {
1092                 modinst *mi = mt->mt_mods;
1093
1094                 /* If there are more, promote the next one */
1095                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1096                 if ( mi->mi_next ) {
1097                         mt->mt_mods = mi->mi_next;
1098                         mt->mt_op = mt->mt_mods->mi_op;
1099                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1100                 } else {
1101                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1102                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1103                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1104                         ch_free( mt );
1105                 }
1106         }
1107         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1108         if ( !BER_BVISNULL( &opc->suuid ))
1109                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1110         if ( !BER_BVISNULL( &opc->sndn ))
1111                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1112         if ( !BER_BVISNULL( &opc->sdn ))
1113                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1114         op->o_callback = cb->sc_next;
1115         op->o_tmpfree(cb, op->o_tmpmemctx);
1116
1117         return 0;
1118 }
1119
1120 static void
1121 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1122 {
1123         syncprov_info_t         *si = on->on_bi.bi_private;
1124         Modifications mod;
1125         Operation opm;
1126         struct berval bv[2];
1127         slap_callback cb = {0};
1128         int manage = get_manageDSAit(op);
1129
1130         mod.sml_values = bv;
1131         bv[1].bv_val = NULL;
1132         bv[0] = si->si_ctxcsn;
1133         mod.sml_nvalues = NULL;
1134         mod.sml_desc = slap_schema.si_ad_contextCSN;
1135         mod.sml_op = LDAP_MOD_REPLACE;
1136         mod.sml_next = NULL;
1137
1138         cb.sc_response = slap_null_cb;
1139         opm = *op;
1140         opm.o_tag = LDAP_REQ_MODIFY;
1141         opm.o_callback = &cb;
1142         opm.orm_modlist = &mod;
1143         opm.o_req_dn = op->o_bd->be_suffix[0];
1144         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1145         opm.o_bd->bd_info = on->on_info->oi_orig;
1146         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1147         opm.o_bd->be_modify( &opm, rs );
1148         opm.o_managedsait = manage;
1149 }
1150
1151 static void
1152 syncprov_add_slog( Operation *op, struct berval *csn )
1153 {
1154         opcookie *opc = op->o_callback->sc_private;
1155         slap_overinst *on = opc->son;
1156         syncprov_info_t         *si = on->on_bi.bi_private;
1157         sessionlog *sl;
1158         slog_entry *se;
1159
1160         sl = si->si_logs;
1161         {
1162                 /* Allocate a record. UUIDs are not NUL-terminated. */
1163                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1164                         csn->bv_len + 1 );
1165                 se->se_next = NULL;
1166                 se->se_tag = op->o_tag;
1167
1168                 se->se_uuid.bv_val = (char *)(se+1);
1169                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len + 1;
1170                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1171                 se->se_uuid.bv_len = opc->suuid.bv_len;
1172
1173                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1174                 se->se_csn.bv_val[csn->bv_len] = '\0';
1175                 se->se_csn.bv_len = csn->bv_len;
1176
1177                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1178                 if ( sl->sl_head ) {
1179                         sl->sl_tail->se_next = se;
1180                 } else {
1181                         sl->sl_head = se;
1182                 }
1183                 sl->sl_tail = se;
1184                 sl->sl_num++;
1185                 while ( sl->sl_num > sl->sl_size ) {
1186                         se = sl->sl_head;
1187                         sl->sl_head = se->se_next;
1188                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1189                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1190                         ch_free( se );
1191                         sl->sl_num--;
1192                         if ( !sl->sl_head ) {
1193                                 sl->sl_tail = NULL;
1194                         }
1195                 }
1196                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1197         }
1198 }
1199
1200 /* Just set a flag if we found the matching entry */
1201 static int
1202 playlog_cb( Operation *op, SlapReply *rs )
1203 {
1204         if ( rs->sr_type == REP_SEARCH ) {
1205                 op->o_callback->sc_private = (void *)1;
1206         }
1207         return rs->sr_err;
1208 }
1209
1210 /* enter with sl->sl_mutex locked, release before returning */
1211 static void
1212 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1213         struct berval *oldcsn, struct berval *ctxcsn )
1214 {
1215         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1216         syncprov_info_t         *si = on->on_bi.bi_private;
1217         slog_entry *se;
1218         int i, j, ndel, num, nmods, mmods;
1219         BerVarray uuids;
1220
1221         if ( !sl->sl_num ) {
1222                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1223                 return;
1224         }
1225
1226         num = sl->sl_num;
1227         i = 0;
1228         nmods = 0;
1229
1230         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1231                 num * UUID_LEN, op->o_tmpmemctx );
1232
1233         uuids[0].bv_val = (char *)(uuids + num + 1);
1234
1235         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1236          * and everything else at the end. Do this first so we can
1237          * unlock the list mutex.
1238          */
1239         for ( se=sl->sl_head; se; se=se->se_next ) {
1240                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1241                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1242                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1243                         j = i;
1244                         i++;
1245                 } else {
1246                         nmods++;
1247                         j = num - nmods;
1248                 }
1249                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1250                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1251                 uuids[j].bv_len = UUID_LEN;
1252         }
1253         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1254
1255         ndel = i;
1256
1257         /* Zero out unused slots */
1258         for ( i=ndel; i < num - nmods; i++ )
1259                 uuids[i].bv_len = 0;
1260
1261         /* Mods must be validated to see if they belong in this delete set.
1262          */
1263
1264         mmods = nmods;
1265         /* Strip any duplicates */
1266         for ( i=0; i<nmods; i++ ) {
1267                 for ( j=0; j<ndel; j++ ) {
1268                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1269                                 uuids[num - 1 - i].bv_len = 0;
1270                                 mmods --;
1271                                 break;
1272                         }
1273                 }
1274                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1275                 for ( j=0; j<i; j++ ) {
1276                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1277                                 uuids[num - 1 - i].bv_len = 0;
1278                                 mmods --;
1279                                 break;
1280                         }
1281                 }
1282         }
1283
1284         if ( mmods ) {
1285                 Operation fop;
1286                 SlapReply frs = { REP_RESULT };
1287                 int rc;
1288                 Filter mf, af;
1289 #ifdef LDAP_COMP_MATCH
1290                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1291 #else
1292                 AttributeAssertion eq;
1293 #endif
1294                 slap_callback cb = {0};
1295
1296                 fop = *op;
1297
1298                 fop.o_sync_mode = 0;
1299                 fop.o_callback = &cb;
1300                 fop.ors_limit = NULL;
1301                 fop.ors_tlimit = SLAP_NO_LIMIT;
1302                 fop.ors_attrs = slap_anlist_all_attributes;
1303                 fop.ors_attrsonly = 0;
1304                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1305
1306                 af.f_choice = LDAP_FILTER_AND;
1307                 af.f_next = NULL;
1308                 af.f_and = &mf;
1309                 mf.f_choice = LDAP_FILTER_EQUALITY;
1310                 mf.f_ava = &eq;
1311                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1312                 mf.f_next = fop.ors_filter;
1313
1314                 fop.ors_filter = &af;
1315
1316                 cb.sc_response = playlog_cb;
1317                 fop.o_bd->bd_info = on->on_info->oi_orig;
1318
1319                 for ( i=ndel; i<num; i++ ) {
1320                         if ( uuids[i].bv_len == 0 ) continue;
1321
1322                         mf.f_av_value = uuids[i];
1323                         cb.sc_private = NULL;
1324                         fop.ors_slimit = 1;
1325                         rc = fop.o_bd->be_search( &fop, &frs );
1326
1327                         /* If entry was not found, add to delete list */
1328                         if ( !cb.sc_private ) {
1329                                 uuids[ndel++] = uuids[i];
1330                         }
1331                 }
1332                 fop.o_bd->bd_info = (BackendInfo *)on;
1333         }
1334         if ( ndel ) {
1335                 uuids[ndel].bv_val = NULL;
1336                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1337         }
1338 }
1339
1340 static int
1341 syncprov_op_response( Operation *op, SlapReply *rs )
1342 {
1343         opcookie *opc = op->o_callback->sc_private;
1344         slap_overinst *on = opc->son;
1345         syncprov_info_t         *si = on->on_bi.bi_private;
1346         syncmatches *sm;
1347
1348         if ( rs->sr_err == LDAP_SUCCESS )
1349         {
1350                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1351                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1352
1353                 /* Update our context CSN */
1354                 cbuf[0] = '\0';
1355                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1356                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1357                 if ( !BER_BVISNULL( &maxcsn ) ) {
1358                         strcpy( cbuf, maxcsn.bv_val );
1359                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1360                                 strcpy( si->si_ctxcsnbuf, cbuf );
1361                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1362                         }
1363                 }
1364
1365                 /* Don't do any processing for consumer contextCSN updates */
1366                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1367                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1368                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1369                         return SLAP_CB_CONTINUE;
1370                 }
1371
1372                 si->si_numops++;
1373                 if ( si->si_chkops || si->si_chktime ) {
1374                         int do_check=0;
1375                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1376                                 do_check = 1;
1377                                 si->si_numops = 0;
1378                         }
1379                         if ( si->si_chktime &&
1380                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1381                                 do_check = 1;
1382                                 si->si_chklast = op->o_time;
1383                         }
1384                         if ( do_check ) {
1385                                 syncprov_checkpoint( op, rs, on );
1386                         }
1387                 }
1388                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1389
1390                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1391                 opc->sctxcsn.bv_val = cbuf;
1392
1393                 /* Handle any persistent searches */
1394                 if ( si->si_ops ) {
1395                         switch(op->o_tag) {
1396                         case LDAP_REQ_ADD:
1397                         case LDAP_REQ_MODIFY:
1398                         case LDAP_REQ_MODRDN:
1399                         case LDAP_REQ_EXTENDED:
1400                                 syncprov_matchops( op, opc, 0 );
1401                                 break;
1402                         case LDAP_REQ_DELETE:
1403                                 /* for each match in opc->smatches:
1404                                  *   send DELETE msg
1405                                  */
1406                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1407                                         if ( sm->sm_op->s_op->o_abandon )
1408                                                 continue;
1409                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
1410                                                 LDAP_SYNC_DELETE, 1 );
1411                                 }
1412                                 break;
1413                         }
1414                 }
1415
1416                 /* Add any log records */
1417                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1418                         syncprov_add_slog( op, &curcsn );
1419                 }
1420
1421         }
1422         return SLAP_CB_CONTINUE;
1423 }
1424
1425 /* We don't use a subentry to store the context CSN any more.
1426  * We expose the current context CSN as an operational attribute
1427  * of the suffix entry.
1428  */
1429 static int
1430 syncprov_op_compare( Operation *op, SlapReply *rs )
1431 {
1432         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1433         syncprov_info_t         *si = on->on_bi.bi_private;
1434         int rc = SLAP_CB_CONTINUE;
1435
1436         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1437                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1438         {
1439                 Entry e = {0};
1440                 Attribute a = {0};
1441                 struct berval bv[2];
1442
1443                 e.e_name = op->o_bd->be_suffix[0];
1444                 e.e_nname = op->o_bd->be_nsuffix[0];
1445
1446                 BER_BVZERO( &bv[1] );
1447                 bv[0] = si->si_ctxcsn;
1448
1449                 a.a_desc = slap_schema.si_ad_contextCSN;
1450                 a.a_vals = bv;
1451                 a.a_nvals = a.a_vals;
1452
1453                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1454
1455                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1456                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1457                 if ( ! rs->sr_err ) {
1458                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1459                         goto return_results;
1460                 }
1461
1462                 if ( get_assert( op ) &&
1463                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1464                 {
1465                         rs->sr_err = LDAP_ASSERTION_FAILED;
1466                         goto return_results;
1467                 }
1468
1469
1470                 rs->sr_err = LDAP_COMPARE_FALSE;
1471
1472                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1473                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1474                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1475                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1476                 {
1477                         rs->sr_err = LDAP_COMPARE_TRUE;
1478                 }
1479
1480 return_results:;
1481
1482                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1483
1484                 send_ldap_result( op, rs );
1485
1486                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1487                         rs->sr_err = LDAP_SUCCESS;
1488                 }
1489                 rc = rs->sr_err;
1490         }
1491
1492         return rc;
1493 }
1494
1495 static int
1496 syncprov_op_mod( Operation *op, SlapReply *rs )
1497 {
1498         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1499         syncprov_info_t         *si = on->on_bi.bi_private;
1500
1501         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1502                 sizeof(opcookie) +
1503                 (si->si_ops ? sizeof(modinst) : 0 ),
1504                 op->o_tmpmemctx);
1505         opcookie *opc = (opcookie *)(cb+1);
1506         opc->son = on;
1507         cb->sc_response = syncprov_op_response;
1508         cb->sc_cleanup = syncprov_op_cleanup;
1509         cb->sc_private = opc;
1510         cb->sc_next = op->o_callback;
1511         op->o_callback = cb;
1512
1513         /* If there are active persistent searches, lock this operation.
1514          * See seqmod.c for the locking logic on its own.
1515          */
1516         if ( si->si_ops ) {
1517                 modtarget *mt, mtdummy;
1518                 modinst *mi;
1519
1520                 mi = (modinst *)(opc+1);
1521                 mi->mi_op = op;
1522
1523                 /* See if we're already modifying this entry... */
1524                 mtdummy.mt_op = op;
1525                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1526                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1527                 if ( mt ) {
1528                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1529                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1530                         mt->mt_tail->mi_next = mi;
1531                         mt->mt_tail = mi;
1532                         /* wait for this op to get to head of list */
1533                         while ( mt->mt_mods != mi ) {
1534                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1535                                 ldap_pvt_thread_yield();
1536                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1537
1538                                 /* clean up if the caller is giving up */
1539                                 if ( op->o_abandon ) {
1540                                         modinst *m2;
1541                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1542                                                 m2 = m2->mi_next );
1543                                         m2->mi_next = mi->mi_next;
1544                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1545                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1546                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1547                                         return SLAPD_ABANDON;
1548                                 }
1549                         }
1550                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1551                 } else {
1552                         /* Record that we're modifying this entry now */
1553                         mt = ch_malloc( sizeof(modtarget) );
1554                         mt->mt_mods = mi;
1555                         mt->mt_tail = mi;
1556                         mt->mt_op = mi->mi_op;
1557                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1558                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1559                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1560                 }
1561         }
1562
1563         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1564                 syncprov_matchops( op, opc, 1 );
1565
1566         return SLAP_CB_CONTINUE;
1567 }
1568
1569 static int
1570 syncprov_op_extended( Operation *op, SlapReply *rs )
1571 {
1572         if ( exop_is_write( op ))
1573                 return syncprov_op_mod( op, rs );
1574
1575         return SLAP_CB_CONTINUE;
1576 }
1577
1578 typedef struct searchstate {
1579         slap_overinst *ss_on;
1580         syncops *ss_so;
1581         int ss_present;
1582 } searchstate;
1583
1584 static int
1585 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1586 {
1587         if ( rs->sr_ctrls ) {
1588                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1589                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1590                 rs->sr_ctrls = NULL;
1591         }
1592         return 0;
1593 }
1594
1595 static void
1596 syncprov_detach_op( Operation *op, syncops *so )
1597 {
1598         Operation *op2;
1599         int i, alen = 0;
1600         size_t size;
1601         char *ptr;
1602         GroupAssertion *g1, *g2;
1603
1604         /* count the search attrs */
1605         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1606                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1607         }
1608         /* Make a new copy of the operation */
1609         size = sizeof(Operation) + sizeof(Opheader) +
1610                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1611                 op->o_req_dn.bv_len + 1 +
1612                 op->o_req_ndn.bv_len + 1 +
1613                 op->o_ndn.bv_len + 1 +
1614                 so->s_filterstr.bv_len + 1;
1615         op2 = (Operation *)ch_calloc( 1, size );
1616         op2->o_hdr = (Opheader *)(op2+1);
1617
1618         /* Copy the fields we care about explicitly, leave the rest alone */
1619         *op2->o_hdr = *op->o_hdr;
1620         op2->o_tag = op->o_tag;
1621         op2->o_time = op->o_time;
1622         op2->o_bd = op->o_bd;
1623         op2->o_request = op->o_request;
1624
1625         if ( i ) {
1626                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1627                 ptr = (char *)(op2->ors_attrs+i+1);
1628                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1629                         op2->ors_attrs[i] = op->ors_attrs[i];
1630                         op2->ors_attrs[i].an_name.bv_val = ptr;
1631                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1632                 }
1633                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1634         } else {
1635                 ptr = (char *)(op2->o_hdr + 1);
1636         }
1637         op2->o_authz = op->o_authz;
1638         op2->o_ndn.bv_val = ptr;
1639         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1640         op2->o_dn = op2->o_ndn;
1641         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1642         op2->o_req_dn.bv_val = ptr;
1643         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1644         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1645         op2->o_req_ndn.bv_val = ptr;
1646         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1647         op2->ors_filterstr.bv_val = ptr;
1648         strcpy( ptr, so->s_filterstr.bv_val );
1649         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1650         op2->ors_filter = str2filter( ptr );
1651         so->s_op = op2;
1652
1653         /* Copy any cached group ACLs individually */
1654         op2->o_groups = NULL;
1655         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1656                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1657                 *g2 = *g1;
1658                 strcpy( g2->ga_ndn, g1->ga_ndn );
1659                 g2->ga_next = op2->o_groups;
1660                 op2->o_groups = g2;
1661         }
1662
1663         /* Add op2 to conn so abandon will find us */
1664         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1665         op->o_conn->c_n_ops_executing++;
1666         op->o_conn->c_n_ops_completed--;
1667         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1668         so->s_flags |= PS_IS_DETACHED;
1669         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1670 }
1671
1672 static int
1673 syncprov_search_response( Operation *op, SlapReply *rs )
1674 {
1675         searchstate *ss = op->o_callback->sc_private;
1676         slap_overinst *on = ss->ss_on;
1677         syncprov_info_t         *si = on->on_bi.bi_private;
1678         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1679
1680         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1681                 int i;
1682                 /* If we got a referral without a referral object, there's
1683                  * something missing that we cannot replicate. Just ignore it.
1684                  * The consumer will abort because we didn't send the expected
1685                  * control.
1686                  */
1687                 if ( !rs->sr_entry ) {
1688                         assert( rs->sr_entry );
1689                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1690                         return SLAP_CB_CONTINUE;
1691                 }
1692                 if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1693                         Attribute *a = attr_find( rs->sr_entry->e_attrs,
1694                                 slap_schema.si_ad_entryCSN );
1695
1696                         /* Don't send the ctx entry twice */
1697                         if ( a && bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1698                                 return LDAP_SUCCESS;
1699                 }
1700                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1701                         op->o_tmpmemctx );
1702                 rs->sr_ctrls[1] = NULL;
1703                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1704                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1705         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1706                 struct berval cookie;
1707
1708                 slap_compose_sync_cookie( op, &cookie,
1709                         &op->ors_filter->f_and->f_ava->aa_value,
1710                         srs->sr_state.rid );
1711
1712                 /* Is this a regular refresh? */
1713                 if ( !ss->ss_so ) {
1714                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1715                                 op->o_tmpmemctx );
1716                         rs->sr_ctrls[1] = NULL;
1717                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1718                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1719                                         LDAP_SYNC_REFRESH_DELETES );
1720                 } else {
1721                         int locked = 0;
1722                 /* It's RefreshAndPersist, transition to Persist phase */
1723                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1724                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1725                                 &cookie, 1, NULL, 0 );
1726                         /* Flush any queued persist messages */
1727                         if ( ss->ss_so->s_res ) {
1728                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1729                                 locked = 1;
1730                                 syncprov_qplay( op, on, ss->ss_so );
1731                         }
1732
1733                         /* Turn off the refreshing flag */
1734                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1735                         if ( locked )
1736                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1737
1738                         /* Detach this Op from frontend control */
1739                         syncprov_detach_op( op, ss->ss_so );
1740
1741                         return LDAP_SUCCESS;
1742                 }
1743         }
1744
1745         return SLAP_CB_CONTINUE;
1746 }
1747
1748 static int
1749 syncprov_op_search( Operation *op, SlapReply *rs )
1750 {
1751         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1752         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1753         slap_callback   *cb;
1754         int gotstate = 0, nochange = 0, do_present = 1;
1755         Filter *fand, *fava;
1756         syncops *sop = NULL;
1757         searchstate *ss;
1758         sync_control *srs;
1759         struct berval ctxcsn;
1760         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1761
1762         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1763
1764         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1765                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1766                 return rs->sr_err;
1767         }
1768
1769         srs = op->o_controls[slap_cids.sc_LDAPsync];
1770         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1771
1772         /* If this is a persistent search, set it up right away */
1773         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1774                 syncops so = {0};
1775                 fbase_cookie fc;
1776                 opcookie opc;
1777                 slap_callback sc;
1778
1779                 fc.fss = &so;
1780                 fc.fbase = 0;
1781                 so.s_eid = NOID;
1782                 so.s_op = op;
1783                 so.s_flags = PS_IS_REFRESHING;
1784                 /* syncprov_findbase expects to be called as a callback... */
1785                 sc.sc_private = &opc;
1786                 opc.son = on;
1787                 cb = op->o_callback;
1788                 op->o_callback = &sc;
1789                 rs->sr_err = syncprov_findbase( op, &fc );
1790                 op->o_callback = cb;
1791
1792                 if ( rs->sr_err != LDAP_SUCCESS ) {
1793                         send_ldap_result( op, rs );
1794                         return rs->sr_err;
1795                 }
1796                 sop = ch_malloc( sizeof( syncops ));
1797                 *sop = so;
1798                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1799                 sop->s_rid = srs->sr_state.rid;
1800                 sop->s_inuse = 1;
1801
1802                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1803                 sop->s_next = si->si_ops;
1804                 si->si_ops = sop;
1805                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1806         }
1807
1808         /* snapshot the ctxcsn */
1809         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1810         strcpy( csnbuf, si->si_ctxcsnbuf );
1811         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1812         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1813         ctxcsn.bv_val = csnbuf;
1814
1815         /* If we have a cookie, handle the PRESENT lookups */
1816         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1817                 sessionlog *sl;
1818
1819                 /* The cookie was validated when it was parsed, just use it */
1820
1821                 /* If just Refreshing and nothing has changed, shortcut it */
1822                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1823                         nochange = 1;
1824                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1825                                 LDAPControl     *ctrls[2];
1826
1827                                 ctrls[0] = NULL;
1828                                 ctrls[1] = NULL;
1829                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1830                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1831                                 rs->sr_ctrls = ctrls;
1832                                 rs->sr_err = LDAP_SUCCESS;
1833                                 send_ldap_result( op, rs );
1834                                 rs->sr_ctrls = NULL;
1835                                 return rs->sr_err;
1836                         }
1837                         goto shortcut;
1838                 }
1839                 /* Do we have a sessionlog for this search? */
1840                 sl=si->si_logs;
1841                 if ( sl ) {
1842                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1843                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1844                                 do_present = 0;
1845                                 /* mutex is unlocked in playlog */
1846                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1847                         } else {
1848                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1849                         }
1850                 }
1851                 /* Is the CSN still present in the database? */
1852                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1853                         /* No, so a reload is required */
1854 #if 0           /* the consumer doesn't seem to send this hint */
1855                         if ( op->o_sync_rhint == 0 ) {
1856                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1857                                 return rs->sr_err;
1858                         }
1859 #endif
1860                 } else {
1861                         gotstate = 1;
1862                         /* If changed and doing Present lookup, send Present UUIDs */
1863                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1864                                 LDAP_SUCCESS ) {
1865                                 send_ldap_result( op, rs );
1866                                 return rs->sr_err;
1867                         }
1868                 }
1869         }
1870
1871 shortcut:
1872         /* Append CSN range to search filter, save original filter
1873          * for persistent search evaluation
1874          */
1875         if ( sop ) {
1876                 sop->s_filterstr= op->ors_filterstr;
1877         }
1878
1879         fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1880         fand->f_choice = LDAP_FILTER_AND;
1881         fand->f_next = NULL;
1882         fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1883         fava->f_choice = LDAP_FILTER_LE;
1884         fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1885         fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1886 #ifdef LDAP_COMP_MATCH
1887         fava->f_ava->aa_cf = NULL;
1888 #endif
1889         ber_dupbv_x( &fava->f_ava->aa_value, &ctxcsn, op->o_tmpmemctx );
1890         fand->f_and = fava;
1891         if ( gotstate ) {
1892                 fava->f_next = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1893                 fava = fava->f_next;
1894                 fava->f_choice = LDAP_FILTER_GE;
1895                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1896                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1897 #ifdef LDAP_COMP_MATCH
1898                 fava->f_ava->aa_cf = NULL;
1899 #endif
1900                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1901         }
1902         fava->f_next = op->ors_filter;
1903         op->ors_filter = fand;
1904         filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1905
1906         /* Let our callback add needed info to returned entries */
1907         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1908         ss = (searchstate *)(cb+1);
1909         ss->ss_on = on;
1910         ss->ss_so = sop;
1911         ss->ss_present = do_present;
1912         cb->sc_response = syncprov_search_response;
1913         cb->sc_cleanup = syncprov_search_cleanup;
1914         cb->sc_private = ss;
1915         cb->sc_next = op->o_callback;
1916         op->o_callback = cb;
1917
1918 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
1919         op->o_sync_mode &= SLAP_CONTROL_MASK;
1920 #endif
1921
1922         /* If this is a persistent search and no changes were reported during
1923          * the refresh phase, just invoke the response callback to transition
1924          * us into persist phase
1925          */
1926         if ( nochange ) {
1927                 rs->sr_err = LDAP_SUCCESS;
1928                 rs->sr_nentries = 0;
1929                 send_ldap_result( op, rs );
1930                 return rs->sr_err;
1931         }
1932         return SLAP_CB_CONTINUE;
1933 }
1934
1935 static int
1936 syncprov_operational(
1937         Operation *op,
1938         SlapReply *rs )
1939 {
1940         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1941         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1942
1943         if ( rs->sr_entry &&
1944                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
1945
1946                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
1947                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
1948                         Attribute *a, **ap = NULL;
1949
1950                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
1951                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
1952                                         break;
1953                         }
1954
1955                         if ( !a ) {
1956                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
1957
1958                                 a = ch_malloc( sizeof(Attribute));
1959                                 a->a_desc = slap_schema.si_ad_contextCSN;
1960                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
1961                                 a->a_vals[1].bv_val = NULL;
1962                                 a->a_nvals = a->a_vals;
1963                                 a->a_next = NULL;
1964                                 a->a_flags = 0;
1965                                 *ap = a;
1966                         }
1967
1968                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1969                         if ( !ap ) {
1970                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
1971                         } else {
1972                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
1973                         }
1974                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1975                 }
1976         }
1977         return SLAP_CB_CONTINUE;
1978 }
1979
1980 static int
1981 syncprov_db_config(
1982         BackendDB       *be,
1983         const char      *fname,
1984         int             lineno,
1985         int             argc,
1986         char    **argv
1987 )
1988 {
1989         slap_overinst           *on = (slap_overinst *)be->bd_info;
1990         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1991
1992         if ( strcasecmp( argv[ 0 ], "syncprov-checkpoint" ) == 0 ) {
1993                 if ( argc != 3 ) {
1994                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
1995                                 "\"syncprov-checkpoint <ops> <minutes>\"\n", fname, lineno );
1996                         return -1;
1997                 }
1998                 si->si_chkops = atoi( argv[1] );
1999                 si->si_chktime = atoi( argv[2] ) * 60;
2000                 return 0;
2001
2002         } else if ( strcasecmp( argv[0], "syncprov-sessionlog" ) == 0 ) {
2003                 sessionlog *sl;
2004                 int size;
2005                 if ( argc != 2 ) {
2006                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
2007                                 "\"syncprov-sessionlog <size>\"\n", fname, lineno );
2008                         return -1;
2009                 }
2010                 size = atoi( argv[1] );
2011                 if ( size < 0 ) {
2012                         fprintf( stderr,
2013                                 "%s: line %d: session log size %d is negative\n",
2014                                 fname, lineno, size );
2015                         return -1;
2016                 }
2017                 sl = si->si_logs;
2018                 if ( !sl ) {
2019                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2020                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2021                         sl->sl_mincsn.bv_len = 0;
2022                         sl->sl_num = 0;
2023                         sl->sl_head = sl->sl_tail = NULL;
2024                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2025                         si->si_logs = sl;
2026                 }
2027                 sl->sl_size = size;
2028                 return 0;
2029         }
2030
2031         return SLAP_CONF_UNKNOWN;
2032 }
2033
2034 /* Cheating - we have no thread pool context for these functions,
2035  * so make one.
2036  */
2037 typedef struct thread_keys {
2038         void *key;
2039         void *data;
2040         ldap_pvt_thread_pool_keyfree_t *xfree;
2041 } thread_keys;
2042
2043 #define MAXKEYS 32
2044 /* A fake thread context */
2045 static thread_keys thrctx[MAXKEYS];
2046
2047 /* Read any existing contextCSN from the underlying db.
2048  * Then search for any entries newer than that. If no value exists,
2049  * just generate it. Cache whatever result.
2050  */
2051 static int
2052 syncprov_db_open(
2053     BackendDB *be
2054 )
2055 {
2056         slap_overinst   *on = (slap_overinst *) be->bd_info;
2057         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2058
2059         Connection conn;
2060         char opbuf[OPERATION_BUFFER_SIZE];
2061         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2062         Operation *op = (Operation *)opbuf;
2063         Entry *e;
2064         Attribute *a;
2065         int rc;
2066
2067         if ( slapMode & SLAP_TOOL_MODE ) {
2068                 return 0;
2069         }
2070
2071         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2072         if ( rc ) {
2073                 return rc;
2074         }
2075
2076         connection_fake_init( &conn, op, thrctx );
2077         op->o_bd = be;
2078         op->o_dn = be->be_rootdn;
2079         op->o_ndn = be->be_rootndn;
2080
2081         ctxcsnbuf[0] = '\0';
2082
2083         op->o_bd->bd_info = on->on_info->oi_orig;
2084         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2085                 slap_schema.si_ad_contextCSN, 0, &e );
2086
2087         if ( e ) {
2088                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2089                 if ( a ) {
2090                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2091                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2092                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2093                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2094                                 si->si_ctxcsn.bv_len );
2095                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2096                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2097                 }
2098                 be_entry_release_rw( op, e, 0 );
2099                 op->o_bd->bd_info = (BackendInfo *)on;
2100                 op->o_req_dn = be->be_suffix[0];
2101                 op->o_req_ndn = be->be_nsuffix[0];
2102                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2103                 syncprov_findcsn( op, FIND_MAXCSN );
2104         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2105                 /* If we're also a consumer, and we didn't find the context entry,
2106                  * then don't generate anything, wait for our provider to send it
2107                  * to us.
2108                  */
2109                 goto out;
2110         }
2111
2112         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2113                 slap_get_csn( op, si->si_ctxcsnbuf, sizeof(si->si_ctxcsnbuf),
2114                                 &si->si_ctxcsn, 0 );
2115         }
2116
2117         /* If our ctxcsn is different from what was read from the root
2118          * entry, write the new value out.
2119          */
2120         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2121                 SlapReply rs = {REP_RESULT};
2122                 syncprov_checkpoint( op, &rs, on );
2123         }
2124
2125 out:
2126         op->o_bd->bd_info = (BackendInfo *)on;
2127         return 0;
2128 }
2129
2130 /* Write the current contextCSN into the underlying db.
2131  */
2132 static int
2133 syncprov_db_close(
2134     BackendDB *be
2135 )
2136 {
2137     slap_overinst   *on = (slap_overinst *) be->bd_info;
2138     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2139         int i;
2140
2141         if ( slapMode & SLAP_TOOL_MODE ) {
2142                 return 0;
2143         }
2144         if ( si->si_numops ) {
2145                 Connection conn;
2146                 char opbuf[OPERATION_BUFFER_SIZE];
2147                 Operation *op = (Operation *)opbuf;
2148                 SlapReply rs = {REP_RESULT};
2149
2150                 connection_fake_init( &conn, op, thrctx );
2151                 op->o_bd = be;
2152                 op->o_dn = be->be_rootdn;
2153                 op->o_ndn = be->be_rootndn;
2154                 syncprov_checkpoint( op, &rs, on );
2155         }
2156         for ( i=0; thrctx[i].key; i++) {
2157                 if ( thrctx[i].xfree )
2158                         thrctx[i].xfree( thrctx[i].key, thrctx[i].data );
2159                 thrctx[i].key = NULL;
2160         }
2161
2162     return 0;
2163 }
2164
2165 static int
2166 syncprov_db_init(
2167         BackendDB *be
2168 )
2169 {
2170         slap_overinst   *on = (slap_overinst *)be->bd_info;
2171         syncprov_info_t *si;
2172
2173         si = ch_calloc(1, sizeof(syncprov_info_t));
2174         on->on_bi.bi_private = si;
2175         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2176         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2177         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2178         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2179
2180         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2181         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2182
2183         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2184         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2185
2186         return 0;
2187 }
2188
2189 static int
2190 syncprov_db_destroy(
2191         BackendDB *be
2192 )
2193 {
2194         slap_overinst   *on = (slap_overinst *)be->bd_info;
2195         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2196
2197         if ( si ) {
2198                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2199                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2200                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2201                 ch_free( si );
2202         }
2203
2204         return 0;
2205 }
2206
2207 static int syncprov_parseCtrl (
2208         Operation *op,
2209         SlapReply *rs,
2210         LDAPControl *ctrl )
2211 {
2212         ber_tag_t tag;
2213         BerElement *ber;
2214         ber_int_t mode;
2215         ber_len_t len;
2216         struct berval cookie = BER_BVNULL;
2217         sync_control *sr;
2218         int rhint = 0;
2219
2220         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2221                 rs->sr_text = "Sync control specified multiple times";
2222                 return LDAP_PROTOCOL_ERROR;
2223         }
2224
2225         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2226                 rs->sr_text = "Sync control specified with pagedResults control";
2227                 return LDAP_PROTOCOL_ERROR;
2228         }
2229
2230         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2231                 rs->sr_text = "Sync control value is empty (or absent)";
2232                 return LDAP_PROTOCOL_ERROR;
2233         }
2234
2235         /* Parse the control value
2236          *      syncRequestValue ::= SEQUENCE {
2237          *              mode   ENUMERATED {
2238          *                      -- 0 unused
2239          *                      refreshOnly             (1),
2240          *                      -- 2 reserved
2241          *                      refreshAndPersist       (3)
2242          *              },
2243          *              cookie  syncCookie OPTIONAL
2244          *      }
2245          */
2246
2247         ber = ber_init( &ctrl->ldctl_value );
2248         if( ber == NULL ) {
2249                 rs->sr_text = "internal error";
2250                 return LDAP_OTHER;
2251         }
2252
2253         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2254                 rs->sr_text = "Sync control : mode decoding error";
2255                 return LDAP_PROTOCOL_ERROR;
2256         }
2257
2258         switch( mode ) {
2259         case LDAP_SYNC_REFRESH_ONLY:
2260                 mode = SLAP_SYNC_REFRESH;
2261                 break;
2262         case LDAP_SYNC_REFRESH_AND_PERSIST:
2263                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2264                 break;
2265         default:
2266                 rs->sr_text = "Sync control : unknown update mode";
2267                 return LDAP_PROTOCOL_ERROR;
2268         }
2269
2270         tag = ber_peek_tag( ber, &len );
2271
2272         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2273                 if (( ber_scanf( ber, /*{*/ "o", &cookie )) == LBER_ERROR ) {
2274                         rs->sr_text = "Sync control : cookie decoding error";
2275                         return LDAP_PROTOCOL_ERROR;
2276                 }
2277         }
2278         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2279                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2280                         rs->sr_text = "Sync control : rhint decoding error";
2281                         return LDAP_PROTOCOL_ERROR;
2282                 }
2283         }
2284         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2285                         rs->sr_text = "Sync control : decoding error";
2286                         return LDAP_PROTOCOL_ERROR;
2287         }
2288         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2289         sr->sr_rhint = rhint;
2290         if (!BER_BVISNULL(&cookie)) {
2291                 ber_dupbv( &sr->sr_state.octet_str, &cookie );
2292                 slap_parse_sync_cookie( &sr->sr_state );
2293         }
2294
2295         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2296
2297         (void) ber_free( ber, 1 );
2298
2299         op->o_sync = ctrl->ldctl_iscritical
2300                 ? SLAP_CONTROL_CRITICAL
2301                 : SLAP_CONTROL_NONCRITICAL;
2302
2303         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2304
2305         return LDAP_SUCCESS;
2306 }
2307
2308 /* This overlay is set up for dynamic loading via moduleload. For static
2309  * configuration, you'll need to arrange for the slap_overinst to be
2310  * initialized and registered by some other function inside slapd.
2311  */
2312
2313 static slap_overinst            syncprov;
2314
2315 int
2316 syncprov_init()
2317 {
2318         int rc;
2319
2320         rc = register_supported_control( LDAP_CONTROL_SYNC,
2321                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2322                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2323         if ( rc != LDAP_SUCCESS ) {
2324                 fprintf( stderr, "Failed to register control %d\n", rc );
2325                 return rc;
2326         }
2327
2328         syncprov.on_bi.bi_type = "syncprov";
2329         syncprov.on_bi.bi_db_init = syncprov_db_init;
2330         syncprov.on_bi.bi_db_config = syncprov_db_config;
2331         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2332         syncprov.on_bi.bi_db_open = syncprov_db_open;
2333         syncprov.on_bi.bi_db_close = syncprov_db_close;
2334
2335         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2336         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2337
2338         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2339         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2340         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2341         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2342         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2343         syncprov.on_bi.bi_op_search = syncprov_op_search;
2344         syncprov.on_bi.bi_extended = syncprov_op_extended;
2345         syncprov.on_bi.bi_operational = syncprov_operational;
2346
2347         return overlay_register( &syncprov );
2348 }
2349
2350 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2351 int
2352 init_module( int argc, char *argv[] )
2353 {
2354         return syncprov_init();
2355 }
2356 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2357
2358 #endif /* defined(SLAPD_OVER_SYNCPROV) */