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