git.sur5r.net Git - openldap/blob - servers/slapd/overlays/syncprov.c

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2005 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28
  29 /* A modify request on a particular entry */
  30 typedef struct modinst {
  31         struct modinst *mi_next;
  32         Operation *mi_op;
  33 } modinst;
  34
  35 typedef struct modtarget {
  36         struct modinst *mt_mods;
  37         struct modinst *mt_tail;
  38         Operation *mt_op;
  39         ldap_pvt_thread_mutex_t mt_mutex;
  40 } modtarget;
  41
  42 /* A queued result of a persistent search */
  43 typedef struct syncres {
  44         struct syncres *s_next;
  45         struct berval s_dn;
  46         struct berval s_ndn;
  47         struct berval s_uuid;
  48         struct berval s_csn;
  49         char s_mode;
  50         char s_isreference;
  51 } syncres;
  52
  53 /* Record of a persistent search */
  54 typedef struct syncops {
  55         struct syncops *s_next;
  56         struct berval   s_base;         /* ndn of search base */
  57         ID              s_eid;          /* entryID of search base */
  58         Operation       *s_op;          /* search op */
  59         int             s_rid;
  60         struct berval s_filterstr;
  61         int             s_flags;        /* search status */
  62         int             s_inuse;        /* reference count */
  63         struct syncres *s_res;
  64         struct syncres *s_restail;
  65         ldap_pvt_thread_mutex_t s_mutex;
  66 } syncops;
  67
  68 /* A received sync control */
  69 typedef struct sync_control {
  70         struct sync_cookie sr_state;
  71         int sr_rhint;
  72 } sync_control;
  73
  74 #if 0 /* moved back to slap.h */
  75 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  76 #endif
  77 /* o_sync_mode uses data bits of o_sync */
  78 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  79
  80 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  81 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  82 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  83 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  84
  85 #define PS_IS_REFRESHING        0x01
  86 #define PS_IS_DETACHED          0x02
  87
  88 /* Record of which searches matched at premodify step */
  89 typedef struct syncmatches {
  90         struct syncmatches *sm_next;
  91         syncops *sm_op;
  92 } syncmatches;
  93
  94 /* Session log data */
  95 typedef struct slog_entry {
  96         struct slog_entry *se_next;
  97         struct berval se_uuid;
  98         struct berval se_csn;
  99         ber_tag_t       se_tag;
 100 } slog_entry;
 101
 102 typedef struct sessionlog {
 103         struct berval   sl_mincsn;
 104         int             sl_num;
 105         int             sl_size;
 106         slog_entry *sl_head;
 107         slog_entry *sl_tail;
 108         ldap_pvt_thread_mutex_t sl_mutex;
 109 } sessionlog;
 110
 111 /* The main state for this overlay */
 112 typedef struct syncprov_info_t {
 113         syncops         *si_ops;
 114         struct berval   si_ctxcsn;      /* ldapsync context */
 115         int             si_chkops;      /* checkpointing info */
 116         int             si_chktime;
 117         int             si_numops;      /* number of ops since last checkpoint */
 118         time_t  si_chklast;     /* time of last checkpoint */
 119         Avlnode *si_mods;       /* entries being modified */
 120         sessionlog      *si_logs;
 121         ldap_pvt_thread_mutex_t si_csn_mutex;
 122         ldap_pvt_thread_mutex_t si_ops_mutex;
 123         ldap_pvt_thread_mutex_t si_mods_mutex;
 124         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 125 } syncprov_info_t;
 126
 127 typedef struct opcookie {
 128         slap_overinst *son;
 129         syncmatches *smatches;
 130         struct berval sdn;      /* DN of entry, for deletes */
 131         struct berval sndn;
 132         struct berval suuid;    /* UUID of entry */
 133         struct berval sctxcsn;
 134         int sreference; /* Is the entry a reference? */
 135 } opcookie;
 136
 137 typedef struct fbase_cookie {
 138         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 139         syncops *fss;   /* persistent search we're testing against */
 140         int fbase;      /* if TRUE we found the search base and it's still valid */
 141         int fscope;     /* if TRUE then fdn is within the psearch scope */
 142 } fbase_cookie;
 143
 144 static AttributeName csn_anlist[2];
 145 static AttributeName uuid_anlist[2];
 146
 147 /* Build a LDAPsync intermediate state control */
 148 static int
 149 syncprov_state_ctrl(
 150         Operation       *op,
 151         SlapReply       *rs,
 152         Entry           *e,
 153         int             entry_sync_state,
 154         LDAPControl     **ctrls,
 155         int             num_ctrls,
 156         int             send_cookie,
 157         struct berval   *cookie )
 158 {
 159         Attribute* a;
 160         int ret;
 161         int res;
 162         const char *text = NULL;
 163
 164         BerElementBuffer berbuf;
 165         BerElement *ber = (BerElement *)&berbuf;
 166
 167         struct berval   entryuuid_bv = BER_BVNULL;
 168
 169         ber_init2( ber, 0, LBER_USE_DER );
 170         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 171
 172         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 173
 174         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 175                 AttributeDescription *desc = a->a_desc;
 176                 if ( desc == slap_schema.si_ad_entryUUID ) {
 177                         entryuuid_bv = a->a_nvals[0];
 178                         break;
 179                 }
 180         }
 181
 182         if ( send_cookie && cookie ) {
 183                 ber_printf( ber, "{eOON}",
 184                         entry_sync_state, &entryuuid_bv, cookie );
 185         } else {
 186                 ber_printf( ber, "{eON}",
 187                         entry_sync_state, &entryuuid_bv );
 188         }
 189
 190         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 191         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 192         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 193
 194         ber_free_buf( ber );
 195
 196         if ( ret < 0 ) {
 197                 Debug( LDAP_DEBUG_TRACE,
 198                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 199                         0, 0, 0 );
 200                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 201                 return ret;
 202         }
 203
 204         return LDAP_SUCCESS;
 205 }
 206
 207 /* Build a LDAPsync final state control */
 208 static int
 209 syncprov_done_ctrl(
 210         Operation       *op,
 211         SlapReply       *rs,
 212         LDAPControl     **ctrls,
 213         int                     num_ctrls,
 214         int                     send_cookie,
 215         struct berval *cookie,
 216         int                     refreshDeletes )
 217 {
 218         int ret;
 219         BerElementBuffer berbuf;
 220         BerElement *ber = (BerElement *)&berbuf;
 221
 222         ber_init2( ber, NULL, LBER_USE_DER );
 223         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 224
 225         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 226
 227         ber_printf( ber, "{" );
 228         if ( send_cookie && cookie ) {
 229                 ber_printf( ber, "O", cookie );
 230         }
 231         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 232                 ber_printf( ber, "b", refreshDeletes );
 233         }
 234         ber_printf( ber, "N}" );
 235
 236         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 237         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 238         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 239
 240         ber_free_buf( ber );
 241
 242         if ( ret < 0 ) {
 243                 Debug( LDAP_DEBUG_TRACE,
 244                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 245                         0, 0, 0 );
 246                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 247                 return ret;
 248         }
 249
 250         return LDAP_SUCCESS;
 251 }
 252
 253 #if 0
 254 /* Generate state based on session log - not implemented yet */
 255 static int
 256 syncprov_state_ctrl_from_slog(
 257         Operation       *op,
 258         SlapReply       *rs,
 259         struct slog_entry *slog_e,
 260         int                     entry_sync_state,
 261         LDAPControl     **ctrls,
 262         int                     num_ctrls,
 263         int                     send_cookie,
 264         struct berval   *cookie)
 265 {
 266         Attribute* a;
 267         int ret;
 268         int res;
 269         const char *text = NULL;
 270
 271         BerElementBuffer berbuf;
 272         BerElement *ber = (BerElement *)&berbuf;
 273
 274         struct berval entryuuid_bv      = BER_BVNULL;
 275
 276         ber_init2( ber, NULL, LBER_USE_DER );
 277         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 278
 279         ctrls[num_ctrls] = ch_malloc ( sizeof ( LDAPControl ) );
 280
 281         entryuuid_bv = slog_e->sl_uuid;
 282
 283         if ( send_cookie && cookie ) {
 284                 ber_printf( ber, "{eOON}",
 285                         entry_sync_state, &entryuuid_bv, cookie );
 286         } else {
 287                 ber_printf( ber, "{eON}",
 288                         entry_sync_state, &entryuuid_bv );
 289         }
 290
 291         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 292         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 293         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 294
 295         ber_free_buf( ber );
 296
 297         if ( ret < 0 ) {
 298                 Debug( LDAP_DEBUG_TRACE,
 299                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 300                         0, 0, 0 );
 301                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 302                 return ret;
 303         }
 304
 305         return LDAP_SUCCESS;
 306 }
 307 #endif
 308
 309 static int
 310 syncprov_sendinfo(
 311         Operation       *op,
 312         SlapReply       *rs,
 313         int                     type,
 314         struct berval *cookie,
 315         int                     refreshDone,
 316         BerVarray       syncUUIDs,
 317         int                     refreshDeletes )
 318 {
 319         BerElementBuffer berbuf;
 320         BerElement *ber = (BerElement *)&berbuf;
 321         struct berval rspdata;
 322
 323         int ret;
 324
 325         ber_init2( ber, NULL, LBER_USE_DER );
 326         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 327
 328         if ( type ) {
 329                 switch ( type ) {
 330                 case LDAP_TAG_SYNC_NEW_COOKIE:
 331                         ber_printf( ber, "tO", type, cookie );
 332                         break;
 333                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 334                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 335                         ber_printf( ber, "t{", type );
 336                         if ( cookie ) {
 337                                 ber_printf( ber, "O", cookie );
 338                         }
 339                         if ( refreshDone == 0 ) {
 340                                 ber_printf( ber, "b", refreshDone );
 341                         }
 342                         ber_printf( ber, "N}" );
 343                         break;
 344                 case LDAP_TAG_SYNC_ID_SET:
 345                         ber_printf( ber, "t{", type );
 346                         if ( cookie ) {
 347                                 ber_printf( ber, "O", cookie );
 348                         }
 349                         if ( refreshDeletes == 1 ) {
 350                                 ber_printf( ber, "b", refreshDeletes );
 351                         }
 352                         ber_printf( ber, "[W]", syncUUIDs );
 353                         ber_printf( ber, "N}" );
 354                         break;
 355                 default:
 356                         Debug( LDAP_DEBUG_TRACE,
 357                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 358                                 type, 0, 0 );
 359                         return LDAP_OTHER;
 360                 }
 361         }
 362
 363         ret = ber_flatten2( ber, &rspdata, 0 );
 364
 365         if ( ret < 0 ) {
 366                 Debug( LDAP_DEBUG_TRACE,
 367                         "syncprov_sendinfo: ber_flatten2 failed\n",
 368                         0, 0, 0 );
 369                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 370                 return ret;
 371         }
 372
 373         rs->sr_rspoid = LDAP_SYNC_INFO;
 374         rs->sr_rspdata = &rspdata;
 375         send_ldap_intermediate( op, rs );
 376         rs->sr_rspdata = NULL;
 377         ber_free_buf( ber );
 378
 379         return LDAP_SUCCESS;
 380 }
 381
 382 /* Find a modtarget in an AVL tree */
 383 static int
 384 sp_avl_cmp( const void *c1, const void *c2 )
 385 {
 386         const modtarget *m1, *m2;
 387         int rc;
 388
 389         m1 = c1; m2 = c2;
 390         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 391
 392         if ( rc ) return rc;
 393         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 394 }
 395
 396 /* syncprov_findbase:
 397  *   finds the true DN of the base of a search (with alias dereferencing) and
 398  * checks to make sure the base entry doesn't get replaced with a different
 399  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 400  * change is detected, any persistent search on this base must be terminated /
 401  * reloaded.
 402  *   On the first call, we just save the DN and entryID. On subsequent calls
 403  * we compare the DN and entryID with the saved values.
 404  */
 405 static int
 406 findbase_cb( Operation *op, SlapReply *rs )
 407 {
 408         slap_callback *sc = op->o_callback;
 409
 410         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 411                 fbase_cookie *fc = sc->sc_private;
 412
 413                 /* If no entryID, we're looking for the first time.
 414                  * Just store whatever we got.
 415                  */
 416                 if ( fc->fss->s_eid == NOID ) {
 417                         fc->fbase = 1;
 418                         fc->fss->s_eid = rs->sr_entry->e_id;
 419                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 420
 421                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 422                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 423
 424                 /* OK, the DN is the same and the entryID is the same. Now
 425                  * see if the fdn resides in the scope.
 426                  */
 427                         fc->fbase = 1;
 428                         switch ( fc->fss->s_op->ors_scope ) {
 429                         case LDAP_SCOPE_BASE:
 430                                 fc->fscope = dn_match( fc->fdn, &rs->sr_entry->e_nname );
 431                                 break;
 432                         case LDAP_SCOPE_ONELEVEL: {
 433                                 struct berval pdn;
 434                                 dnParent( fc->fdn, &pdn );
 435                                 fc->fscope = dn_match( &pdn, &rs->sr_entry->e_nname );
 436                                 break; }
 437                         case LDAP_SCOPE_SUBTREE:
 438                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname );
 439                                 break;
 440 #ifdef LDAP_SCOPE_SUBORDINATE
 441                         case LDAP_SCOPE_SUBORDINATE:
 442                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname ) &&
 443                                         !dn_match( fc->fdn, &rs->sr_entry->e_nname );
 444                                 break;
 445 #endif
 446                         }
 447                 }
 448         }
 449         if ( rs->sr_err != LDAP_SUCCESS ) {
 450                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 451         }
 452         return LDAP_SUCCESS;
 453 }
 454
 455 static int
 456 syncprov_findbase( Operation *op, fbase_cookie *fc )
 457 {
 458         opcookie *opc = op->o_callback->sc_private;
 459         slap_overinst *on = opc->son;
 460         syncprov_info_t         *si = on->on_bi.bi_private;
 461
 462         slap_callback cb = {0};
 463         Operation fop;
 464         SlapReply frs = { REP_RESULT };
 465         int rc;
 466
 467         fop = *op;
 468
 469         cb.sc_response = findbase_cb;
 470         cb.sc_private = fc;
 471
 472         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync mode */
 473         fop.o_callback = &cb;
 474         fop.o_tag = LDAP_REQ_SEARCH;
 475         fop.ors_scope = LDAP_SCOPE_BASE;
 476         fop.ors_deref = fc->fss->s_op->ors_deref;
 477         fop.ors_limit = NULL;
 478         fop.ors_slimit = 1;
 479         fop.ors_tlimit = SLAP_NO_LIMIT;
 480         fop.ors_attrs = slap_anlist_no_attrs;
 481         fop.ors_attrsonly = 1;
 482         fop.ors_filter = fc->fss->s_op->ors_filter;
 483         fop.ors_filterstr = fc->fss->s_op->ors_filterstr;
 484
 485         fop.o_req_ndn = fc->fss->s_op->o_req_ndn;
 486
 487         fop.o_bd->bd_info = on->on_info->oi_orig;
 488         rc = fop.o_bd->be_search( &fop, &frs );
 489         fop.o_bd->bd_info = (BackendInfo *)on;
 490
 491         if ( fc->fbase ) return LDAP_SUCCESS;
 492
 493         /* If entryID has changed, then the base of this search has
 494          * changed. Invalidate the psearch.
 495          */
 496         return LDAP_NO_SUCH_OBJECT;
 497 }
 498
 499 /* syncprov_findcsn:
 500  *   This function has three different purposes, but they all use a search
 501  * that filters on entryCSN so they're combined here.
 502  * 1: at startup time, after a contextCSN has been read from the database,
 503  * we search for all entries with CSN >= contextCSN in case the contextCSN
 504  * was not checkpointed at the previous shutdown.
 505  *
 506  * 2: when the current contextCSN is known and we have a sync cookie, we search
 507  * for one entry with CSN <= the cookie CSN. (Used to search for =.) If an
 508  * entry is found, the cookie CSN is valid, otherwise it is stale.
 509  *
 510  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 511  * CSN, and generate Present records for them. We always collect this result
 512  * in SyncID sets, even if there's only one match.
 513  */
 514 #define FIND_MAXCSN     1
 515 #define FIND_CSN        2
 516 #define FIND_PRESENT    3
 517
 518 static int
 519 findmax_cb( Operation *op, SlapReply *rs )
 520 {
 521         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 522                 struct berval *maxcsn = op->o_callback->sc_private;
 523                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 524                         slap_schema.si_ad_entryCSN );
 525
 526                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 527                         maxcsn->bv_len = a->a_vals[0].bv_len;
 528                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 529                 }
 530         }
 531         return LDAP_SUCCESS;
 532 }
 533
 534 static int
 535 findcsn_cb( Operation *op, SlapReply *rs )
 536 {
 537         slap_callback *sc = op->o_callback;
 538
 539         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 540                 sc->sc_private = (void *)1;
 541         }
 542         return LDAP_SUCCESS;
 543 }
 544
 545 /* Build a list of entryUUIDs for sending in a SyncID set */
 546
 547 #define UUID_LEN        16
 548
 549 typedef struct fpres_cookie {
 550         int num;
 551         BerVarray uuids;
 552         char *last;
 553 } fpres_cookie;
 554
 555 static int
 556 findpres_cb( Operation *op, SlapReply *rs )
 557 {
 558         slap_callback *sc = op->o_callback;
 559         fpres_cookie *pc = sc->sc_private;
 560         Attribute *a;
 561         int ret = SLAP_CB_CONTINUE;
 562
 563         switch ( rs->sr_type ) {
 564         case REP_SEARCH:
 565                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 566                 if ( a ) {
 567                         pc->uuids[pc->num].bv_val = pc->last;
 568                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 569                                 pc->uuids[pc->num].bv_len );
 570                         pc->num++;
 571                         pc->last = pc->uuids[pc->num].bv_val;
 572                         pc->uuids[pc->num].bv_val = NULL;
 573                 }
 574                 ret = LDAP_SUCCESS;
 575                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 576                         break;
 577                 /* FALLTHRU */
 578         case REP_RESULT:
 579                 ret = rs->sr_err;
 580                 if ( pc->num ) {
 581                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 582                                 0, pc->uuids, 0 );
 583                         pc->uuids[pc->num].bv_val = pc->last;
 584                         pc->num = 0;
 585                         pc->last = pc->uuids[0].bv_val;
 586                 }
 587                 break;
 588         default:
 589                 break;
 590         }
 591         return ret;
 592 }
 593
 594 static int
 595 syncprov_findcsn( Operation *op, int mode )
 596 {
 597         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 598         syncprov_info_t         *si = on->on_bi.bi_private;
 599
 600         slap_callback cb = {0};
 601         Operation fop;
 602         SlapReply frs = { REP_RESULT };
 603         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 604         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 605         struct berval fbuf, maxcsn;
 606         Filter cf, af;
 607         AttributeAssertion eq;
 608         int i, rc = LDAP_SUCCESS;
 609         fpres_cookie pcookie;
 610         sync_control *srs = NULL;
 611
 612         if ( mode != FIND_MAXCSN ) {
 613                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 614
 615                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 616                         return LDAP_OTHER;
 617                 }
 618         }
 619
 620         fop = *op;
 621         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 622
 623         fbuf.bv_val = buf;
 624         cf.f_ava = &eq;
 625         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 626         cf.f_next = NULL;
 627
 628         fop.o_callback = &cb;
 629         fop.ors_limit = NULL;
 630         fop.ors_tlimit = SLAP_NO_LIMIT;
 631         fop.ors_filter = &cf;
 632         fop.ors_filterstr = fbuf;
 633
 634         switch( mode ) {
 635         case FIND_MAXCSN:
 636                 cf.f_choice = LDAP_FILTER_GE;
 637                 cf.f_av_value = si->si_ctxcsn;
 638                 fbuf.bv_len = sprintf( buf, "(entryCSN>=%s)",
 639                         cf.f_av_value.bv_val );
 640                 fop.ors_attrsonly = 0;
 641                 fop.ors_attrs = csn_anlist;
 642                 fop.ors_slimit = SLAP_NO_LIMIT;
 643                 cb.sc_private = &maxcsn;
 644                 cb.sc_response = findmax_cb;
 645                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 646                 maxcsn.bv_val = cbuf;
 647                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 648                 break;
 649         case FIND_CSN:
 650                 cf.f_choice = LDAP_FILTER_LE;
 651                 cf.f_av_value = srs->sr_state.ctxcsn;
 652                 fbuf.bv_len = sprintf( buf, "(entryCSN<=%s)",
 653                         cf.f_av_value.bv_val );
 654                 fop.ors_attrsonly = 1;
 655                 fop.ors_attrs = slap_anlist_no_attrs;
 656                 fop.ors_slimit = 1;
 657                 cb.sc_private = NULL;
 658                 cb.sc_response = findcsn_cb;
 659                 break;
 660         case FIND_PRESENT:
 661                 af.f_choice = LDAP_FILTER_AND;
 662                 af.f_next = NULL;
 663                 af.f_and = &cf;
 664                 cf.f_choice = LDAP_FILTER_LE;
 665                 cf.f_av_value = srs->sr_state.ctxcsn;
 666                 cf.f_next = op->ors_filter;
 667                 fop.ors_filter = &af;
 668                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 669                 fop.ors_attrsonly = 0;
 670                 fop.ors_attrs = uuid_anlist;
 671                 fop.ors_slimit = SLAP_NO_LIMIT;
 672                 /* We want pure entries, not referrals */
 673                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 674                 cb.sc_private = &pcookie;
 675                 cb.sc_response = findpres_cb;
 676                 pcookie.num = 0;
 677
 678                 /* preallocate storage for a full set */
 679                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 680                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 681                         op->o_tmpmemctx );
 682                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 683                 pcookie.uuids[0].bv_val = pcookie.last;
 684                 pcookie.uuids[0].bv_len = UUID_LEN;
 685                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 686                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 687                         pcookie.uuids[i].bv_len = UUID_LEN;
 688                 }
 689                 break;
 690         }
 691
 692         fop.o_bd->bd_info = on->on_info->oi_orig;
 693         fop.o_bd->be_search( &fop, &frs );
 694         fop.o_bd->bd_info = (BackendInfo *)on;
 695
 696         switch( mode ) {
 697         case FIND_MAXCSN:
 698                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 699                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 700                 break;
 701         case FIND_CSN:
 702                 /* If matching CSN was not found, invalidate the context. */
 703                 if ( !cb.sc_private ) rc = LDAP_NO_SUCH_OBJECT;
 704                 break;
 705         case FIND_PRESENT:
 706                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 707                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 708                 break;
 709         }
 710
 711         return rc;
 712 }
 713
 714 /* Queue a persistent search response if still in Refresh stage */
 715 static int
 716 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 717 {
 718         syncres *sr;
 719
 720         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 721                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 722         sr->s_next = NULL;
 723         sr->s_dn.bv_val = (char *)(sr + 1);
 724         sr->s_mode = mode;
 725         sr->s_isreference = opc->sreference;
 726         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 727         *(sr->s_ndn.bv_val++) = '\0';
 728         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 729         *(sr->s_uuid.bv_val++) = '\0';
 730         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 731
 732         if ( !so->s_res ) {
 733                 so->s_res = sr;
 734         } else {
 735                 so->s_restail->s_next = sr;
 736         }
 737         so->s_restail = sr;
 738         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 739         return LDAP_SUCCESS;
 740 }
 741
 742 /* Send a persistent search response */
 743 static int
 744 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry *e, int mode, int queue )
 745 {
 746         slap_overinst *on = opc->son;
 747         syncprov_info_t *si = on->on_bi.bi_private;
 748
 749         SlapReply rs = { REP_SEARCH };
 750         LDAPControl *ctrls[2];
 751         struct berval cookie;
 752         Entry e_uuid = {0};
 753         Attribute a_uuid = {0};
 754         Operation sop = *so->s_op;
 755         Opheader ohdr;
 756
 757         ohdr = *sop.o_hdr;
 758         sop.o_hdr = &ohdr;
 759         sop.o_tmpmemctx = op->o_tmpmemctx;
 760         sop.o_bd = op->o_bd;
 761         sop.o_controls = op->o_controls;
 762
 763         if ( queue && (so->s_flags & PS_IS_REFRESHING) ) {
 764                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 765                 if ( so->s_flags & PS_IS_REFRESHING )
 766                         return syncprov_qresp( opc, so, mode );
 767                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 768         }
 769
 770         ctrls[1] = NULL;
 771         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 772
 773         e_uuid.e_attrs = &a_uuid;
 774         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 775         a_uuid.a_nvals = &opc->suuid;
 776         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 777                 mode, ctrls, 0, 1, &cookie );
 778
 779         rs.sr_entry = e;
 780         rs.sr_ctrls = ctrls;
 781         switch( mode ) {
 782         case LDAP_SYNC_ADD:
 783                 if ( opc->sreference ) {
 784                         rs.sr_ref = get_entry_referrals( &sop, e );
 785                         send_search_reference( &sop, &rs );
 786                         ber_bvarray_free( rs.sr_ref );
 787                         break;
 788                 }
 789                 /* fallthru */
 790         case LDAP_SYNC_MODIFY:
 791                 rs.sr_attrs = sop.ors_attrs;
 792                 send_search_entry( &sop, &rs );
 793                 break;
 794         case LDAP_SYNC_DELETE:
 795                 e_uuid.e_attrs = NULL;
 796                 e_uuid.e_name = opc->sdn;
 797                 e_uuid.e_nname = opc->sndn;
 798                 rs.sr_entry = &e_uuid;
 799                 if ( opc->sreference ) {
 800                         struct berval bv = BER_BVNULL;
 801                         rs.sr_ref = &bv;
 802                         send_search_reference( &sop, &rs );
 803                 } else {
 804                         send_search_entry( &sop, &rs );
 805                 }
 806                 break;
 807         default:
 808                 assert(0);
 809         }
 810         op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 811         rs.sr_ctrls = NULL;
 812         return rs.sr_err;
 813 }
 814
 815 static void
 816 syncprov_free_syncop( syncops *so )
 817 {
 818         syncres *sr, *srnext;
 819         GroupAssertion *ga, *gnext;
 820
 821         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 822         so->s_inuse--;
 823         if ( so->s_inuse > 0 ) {
 824                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 825                 return;
 826         }
 827         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 828         if ( so->s_flags & PS_IS_DETACHED ) {
 829                 filter_free( so->s_op->ors_filter );
 830                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 831                         gnext = ga->ga_next;
 832                         ch_free( ga );
 833                 }
 834                 ch_free( so->s_op );
 835         }
 836         ch_free( so->s_base.bv_val );
 837         for ( sr=so->s_res; sr; sr=srnext ) {
 838                 srnext = sr->s_next;
 839                 ch_free( sr );
 840         }
 841         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 842         ch_free( so );
 843 }
 844
 845 static int
 846 syncprov_drop_psearch( syncops *so, int lock )
 847 {
 848         if ( so->s_flags & PS_IS_DETACHED ) {
 849                 if ( lock )
 850                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 851                 so->s_op->o_conn->c_n_ops_executing--;
 852                 so->s_op->o_conn->c_n_ops_completed++;
 853                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 854                         o_next );
 855                 if ( lock )
 856                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 857         }
 858         syncprov_free_syncop( so );
 859
 860         return 0;
 861 }
 862
 863 static int
 864 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 865 {
 866         slap_callback *sc = op->o_callback;
 867         op->o_callback = sc->sc_next;
 868         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 869         op->o_tmpfree( sc, op->o_tmpmemctx );
 870         return 0;
 871 }
 872
 873 static int
 874 syncprov_op_abandon( Operation *op, SlapReply *rs )
 875 {
 876         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 877         syncprov_info_t         *si = on->on_bi.bi_private;
 878         syncops *so, *soprev;
 879
 880         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 881         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 882                 soprev=so, so=so->s_next ) {
 883                 if ( so->s_op->o_connid == op->o_connid &&
 884                         so->s_op->o_msgid == op->orn_msgid ) {
 885                                 so->s_op->o_abandon = 1;
 886                                 soprev->s_next = so->s_next;
 887                                 break;
 888                 }
 889         }
 890         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 891         if ( so ) {
 892                 /* Is this really a Cancel exop? */
 893                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 894                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
 895                         rs->sr_err = LDAP_CANCELLED;
 896                         send_ldap_result( so->s_op, rs );
 897                         if ( so->s_flags & PS_IS_DETACHED ) {
 898                                 slap_callback *cb;
 899                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
 900                                 cb->sc_cleanup = syncprov_ab_cleanup;
 901                                 cb->sc_next = op->o_callback;
 902                                 cb->sc_private = so;
 903                                 return SLAP_CB_CONTINUE;
 904                         }
 905                 }
 906                 syncprov_drop_psearch( so, 0 );
 907         }
 908         return SLAP_CB_CONTINUE;
 909 }
 910
 911 /* Find which persistent searches are affected by this operation */
 912 static void
 913 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 914 {
 915         slap_overinst *on = opc->son;
 916         syncprov_info_t         *si = on->on_bi.bi_private;
 917
 918         fbase_cookie fc;
 919         syncops *ss, *sprev, *snext;
 920         Entry *e;
 921         Attribute *a;
 922         int rc;
 923         struct berval newdn;
 924         int freefdn = 0;
 925
 926         fc.fdn = &op->o_req_ndn;
 927         /* compute new DN */
 928         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 929                 struct berval pdn;
 930                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 931                 else dnParent( fc.fdn, &pdn );
 932                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
 933                 fc.fdn = &newdn;
 934                 freefdn = 1;
 935         }
 936         if ( op->o_tag != LDAP_REQ_ADD ) {
 937                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 938                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
 939                 op->o_bd->bd_info = (BackendInfo *)on;
 940                 if ( rc ) return;
 941         } else {
 942                 e = op->ora_e;
 943         }
 944
 945         if ( saveit ) {
 946                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
 947                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
 948                 opc->sreference = is_entry_referral( e );
 949         }
 950         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
 951                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
 952                 if ( a )
 953                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
 954         }
 955
 956         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 957         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
 958                 sprev = ss, ss=snext)
 959         {
 960                 syncmatches *sm;
 961                 int found = 0;
 962
 963                 snext = ss->s_next;
 964                 /* validate base */
 965                 fc.fss = ss;
 966                 fc.fbase = 0;
 967                 fc.fscope = 0;
 968
 969                 /* If the base of the search is missing, signal a refresh */
 970                 rc = syncprov_findbase( op, &fc );
 971                 if ( rc != LDAP_SUCCESS ) {
 972                         SlapReply rs = {REP_RESULT};
 973                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
 974                                 "search base has changed" );
 975                         sprev->s_next = snext;
 976                         syncprov_drop_psearch( ss, 1 );
 977                         continue;
 978                 }
 979
 980                 /* If we're sending results now, look for this op in old matches */
 981                 if ( !saveit ) {
 982                         syncmatches *old;
 983                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
 984                                 old=sm, sm=sm->sm_next ) {
 985                                 if ( sm->sm_op == ss ) {
 986                                         found = 1;
 987                                         old->sm_next = sm->sm_next;
 988                                         op->o_tmpfree( sm, op->o_tmpmemctx );
 989                                         break;
 990                                 }
 991                         }
 992                 }
 993
 994                 /* check if current o_req_dn is in scope and matches filter */
 995                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
 996                         LDAP_COMPARE_TRUE ) {
 997                         if ( saveit ) {
 998                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
 999                                 sm->sm_next = opc->smatches;
1000                                 sm->sm_op = ss;
1001                                 ss->s_inuse++;
1002                                 opc->smatches = sm;
1003                         } else {
1004                                 /* if found send UPDATE else send ADD */
1005                                 syncprov_sendresp( op, opc, ss, e,
1006                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
1007                         }
1008                 } else if ( !saveit && found ) {
1009                         /* send DELETE */
1010                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
1011                 }
1012         }
1013         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1014 done:
1015         if ( op->o_tag != LDAP_REQ_ADD ) {
1016                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1017                 be_entry_release_rw( op, e, 0 );
1018                 op->o_bd->bd_info = (BackendInfo *)on;
1019         }
1020         if ( freefdn ) {
1021                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1022         }
1023 }
1024
1025 static int
1026 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1027 {
1028         slap_callback *cb = op->o_callback;
1029         opcookie *opc = cb->sc_private;
1030         slap_overinst *on = opc->son;
1031         syncprov_info_t         *si = on->on_bi.bi_private;
1032         syncmatches *sm, *snext;
1033         modtarget *mt, mtdummy;
1034
1035         for (sm = opc->smatches; sm; sm=snext) {
1036                 snext = sm->sm_next;
1037                 syncprov_free_syncop( sm->sm_op );
1038                 op->o_tmpfree( sm, op->o_tmpmemctx );
1039         }
1040
1041         /* Remove op from lock table */
1042         mtdummy.mt_op = op;
1043         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1044         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1045         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1046         if ( mt ) {
1047                 modinst *mi = mt->mt_mods;
1048
1049                 /* If there are more, promote the next one */
1050                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1051                 if ( mi->mi_next ) {
1052                         mt->mt_mods = mi->mi_next;
1053                         mt->mt_op = mt->mt_mods->mi_op;
1054                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1055                 } else {
1056                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1057                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1058                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1059                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1060                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1061                         ch_free( mt );
1062                 }
1063         }
1064         if ( !BER_BVISNULL( &opc->suuid ))
1065                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1066         if ( !BER_BVISNULL( &opc->sndn ))
1067                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1068         if ( !BER_BVISNULL( &opc->sdn ))
1069                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1070         op->o_callback = cb->sc_next;
1071         op->o_tmpfree(cb, op->o_tmpmemctx);
1072
1073         return 0;
1074 }
1075
1076 static void
1077 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1078 {
1079         syncprov_info_t         *si = on->on_bi.bi_private;
1080         Modifications mod;
1081         Operation opm;
1082         struct berval bv[2];
1083         BackendInfo *orig;
1084         slap_callback cb = {0};
1085
1086         mod.sml_values = bv;
1087         bv[1].bv_val = NULL;
1088         bv[0] = si->si_ctxcsn;
1089         mod.sml_nvalues = NULL;
1090         mod.sml_desc = slap_schema.si_ad_contextCSN;
1091         mod.sml_op = LDAP_MOD_REPLACE;
1092         mod.sml_next = NULL;
1093
1094         cb.sc_response = slap_null_cb;
1095         opm = *op;
1096         opm.o_tag = LDAP_REQ_MODIFY;
1097         opm.o_callback = &cb;
1098         opm.orm_modlist = &mod;
1099         opm.o_req_dn = op->o_bd->be_suffix[0];
1100         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1101         orig = opm.o_bd->bd_info;
1102         opm.o_bd->bd_info = on->on_info->oi_orig;
1103         opm.o_bd->be_modify( &opm, rs );
1104 }
1105
1106 static void
1107 syncprov_add_slog( Operation *op, struct berval *csn )
1108 {
1109         opcookie *opc = op->o_callback->sc_private;
1110         slap_overinst *on = opc->son;
1111         syncprov_info_t         *si = on->on_bi.bi_private;
1112         sessionlog *sl;
1113         slog_entry *se;
1114
1115         sl = si->si_logs;
1116         {
1117                 /* Allocate a record. UUIDs are not NUL-terminated. */
1118                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1119                         csn->bv_len + 1 );
1120                 se->se_next = NULL;
1121                 se->se_tag = op->o_tag;
1122
1123                 se->se_uuid.bv_val = (char *)(se+1);
1124                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len + 1;
1125                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1126                 se->se_uuid.bv_len = opc->suuid.bv_len;
1127
1128                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1129                 se->se_csn.bv_val[csn->bv_len] = '\0';
1130                 se->se_csn.bv_len = csn->bv_len;
1131
1132                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1133                 if ( sl->sl_head ) {
1134                         sl->sl_tail->se_next = se;
1135                 } else {
1136                         sl->sl_head = se;
1137                 }
1138                 sl->sl_tail = se;
1139                 sl->sl_num++;
1140                 while ( sl->sl_num > sl->sl_size ) {
1141                         se = sl->sl_head;
1142                         sl->sl_head = se->se_next;
1143                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1144                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1145                         ch_free( se );
1146                         sl->sl_num--;
1147                         if ( !sl->sl_head ) {
1148                                 sl->sl_tail = NULL;
1149                         }
1150                 }
1151                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1152         }
1153 }
1154
1155 /* Just set a flag if we found the matching entry */
1156 static int
1157 playlog_cb( Operation *op, SlapReply *rs )
1158 {
1159         if ( rs->sr_type == REP_SEARCH ) {
1160                 op->o_callback->sc_private = (void *)1;
1161         }
1162         return rs->sr_err;
1163 }
1164
1165 /* enter with sl->sl_mutex locked, release before returning */
1166 static void
1167 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1168         struct berval *oldcsn, struct berval *ctxcsn )
1169 {
1170         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1171         syncprov_info_t         *si = on->on_bi.bi_private;
1172         slog_entry *se;
1173         int i, j, ndel, num, nmods, mmods;
1174         BerVarray uuids;
1175
1176         if ( !sl->sl_num ) {
1177                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1178                 return;
1179         }
1180
1181         num = sl->sl_num;
1182         i = 0;
1183         nmods = 0;
1184
1185         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1186                 num * UUID_LEN, op->o_tmpmemctx );
1187
1188         uuids[0].bv_val = (char *)(uuids + num + 1);
1189
1190         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1191          * and everything else at the end. Do this first so we can
1192          * unlock the list mutex.
1193          */
1194         for ( se=sl->sl_head; se; se=se->se_next ) {
1195                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1196                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1197                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1198                         j = i;
1199                         i++;
1200                 } else {
1201                         nmods++;
1202                         j = num - nmods;
1203                 }
1204                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1205                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1206                 uuids[j].bv_len = UUID_LEN;
1207         }
1208         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1209
1210         ndel = i;
1211
1212         /* Zero out unused slots */
1213         for ( i=ndel; i < num - nmods; i++ )
1214                 uuids[i].bv_len = 0;
1215
1216         /* Mods must be validated to see if they belong in this delete set.
1217          */
1218
1219         mmods = nmods;
1220         /* Strip any duplicates */
1221         for ( i=0; i<nmods; i++ ) {
1222                 for ( j=0; j<ndel; j++ ) {
1223                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1224                                 uuids[num - 1 - i].bv_len = 0;
1225                                 mmods --;
1226                                 break;
1227                         }
1228                 }
1229                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1230                 for ( j=0; j<i; j++ ) {
1231                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1232                                 uuids[num - 1 - i].bv_len = 0;
1233                                 mmods --;
1234                                 break;
1235                         }
1236                 }
1237         }
1238
1239         if ( mmods ) {
1240                 Operation fop;
1241                 SlapReply frs = { REP_RESULT };
1242                 int rc;
1243                 Filter mf, af;
1244                 AttributeAssertion eq;
1245                 slap_callback cb = {0};
1246
1247                 fop = *op;
1248
1249                 fop.o_sync_mode = 0;
1250                 fop.o_callback = &cb;
1251                 fop.ors_limit = NULL;
1252                 fop.ors_tlimit = SLAP_NO_LIMIT;
1253                 fop.ors_attrs = slap_anlist_all_attributes;
1254                 fop.ors_attrsonly = 0;
1255                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1256
1257                 af.f_choice = LDAP_FILTER_AND;
1258                 af.f_next = NULL;
1259                 af.f_and = &mf;
1260                 mf.f_choice = LDAP_FILTER_EQUALITY;
1261                 mf.f_ava = &eq;
1262                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1263                 mf.f_next = fop.ors_filter;
1264
1265                 fop.ors_filter = &af;
1266
1267                 cb.sc_response = playlog_cb;
1268                 fop.o_bd->bd_info = on->on_info->oi_orig;
1269
1270                 for ( i=ndel; i<num; i++ ) {
1271                         if ( uuids[i].bv_len == 0 ) continue;
1272
1273                         mf.f_av_value = uuids[i];
1274                         cb.sc_private = NULL;
1275                         fop.ors_slimit = 1;
1276                         rc = fop.o_bd->be_search( &fop, &frs );
1277
1278                         /* If entry was not found, add to delete list */
1279                         if ( !cb.sc_private ) {
1280                                 uuids[ndel++] = uuids[i];
1281                         }
1282                 }
1283                 fop.o_bd->bd_info = (BackendInfo *)on;
1284         }
1285         if ( ndel ) {
1286                 uuids[ndel].bv_val = NULL;
1287                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1288         }
1289 }
1290
1291 static int
1292 syncprov_op_response( Operation *op, SlapReply *rs )
1293 {
1294         opcookie *opc = op->o_callback->sc_private;
1295         slap_overinst *on = opc->son;
1296         syncprov_info_t         *si = on->on_bi.bi_private;
1297         syncmatches *sm;
1298
1299         if ( rs->sr_err == LDAP_SUCCESS )
1300         {
1301                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1302                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1303
1304                 /* Update our context CSN */
1305                 cbuf[0] = '\0';
1306                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1307                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1308                 if ( !BER_BVISNULL( &maxcsn ) ) {
1309                         strcpy( cbuf, maxcsn.bv_val );
1310                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1311                                 strcpy( si->si_ctxcsnbuf, cbuf );
1312                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1313                         }
1314                 }
1315
1316                 /* Don't do any processing for consumer contextCSN updates */
1317                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1318                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1319                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1320                         return SLAP_CB_CONTINUE;
1321                 }
1322
1323                 si->si_numops++;
1324                 if ( si->si_chkops || si->si_chktime ) {
1325                         int do_check=0;
1326                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1327                                 do_check = 1;
1328                                 si->si_numops = 0;
1329                         }
1330                         if ( si->si_chktime &&
1331                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1332                                 do_check = 1;
1333                                 si->si_chklast = op->o_time;
1334                         }
1335                         if ( do_check ) {
1336                                 syncprov_checkpoint( op, rs, on );
1337                         }
1338                 }
1339                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1340
1341                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1342                 opc->sctxcsn.bv_val = cbuf;
1343
1344                 /* Handle any persistent searches */
1345                 if ( si->si_ops ) {
1346                         switch(op->o_tag) {
1347                         case LDAP_REQ_ADD:
1348                         case LDAP_REQ_MODIFY:
1349                         case LDAP_REQ_MODRDN:
1350                         case LDAP_REQ_EXTENDED:
1351                                 syncprov_matchops( op, opc, 0 );
1352                                 break;
1353                         case LDAP_REQ_DELETE:
1354                                 /* for each match in opc->smatches:
1355                                  *   send DELETE msg
1356                                  */
1357                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1358                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1359                                         if ( sm->sm_op->s_op->o_abandon )
1360                                                 continue;
1361                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
1362                                                 LDAP_SYNC_DELETE, 1 );
1363                                 }
1364                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1365                                 break;
1366                         }
1367                 }
1368
1369                 /* Add any log records */
1370                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1371                         syncprov_add_slog( op, &curcsn );
1372                 }
1373
1374         }
1375         return SLAP_CB_CONTINUE;
1376 }
1377
1378 /* We don't use a subentry to store the context CSN any more.
1379  * We expose the current context CSN as an operational attribute
1380  * of the suffix entry.
1381  */
1382 static int
1383 syncprov_op_compare( Operation *op, SlapReply *rs )
1384 {
1385         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1386         syncprov_info_t         *si = on->on_bi.bi_private;
1387         int rc = SLAP_CB_CONTINUE;
1388
1389         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1390                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1391         {
1392                 Entry e = {0};
1393                 Attribute a = {0};
1394                 struct berval bv[2];
1395
1396                 e.e_name = op->o_bd->be_suffix[0];
1397                 e.e_nname = op->o_bd->be_nsuffix[0];
1398
1399                 BER_BVZERO( &bv[1] );
1400                 bv[0] = si->si_ctxcsn;
1401
1402                 a.a_desc = slap_schema.si_ad_contextCSN;
1403                 a.a_vals = bv;
1404                 a.a_nvals = a.a_vals;
1405
1406                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1407
1408                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1409                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1410                 if ( ! rs->sr_err ) {
1411                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1412                         goto return_results;
1413                 }
1414
1415                 if ( get_assert( op ) &&
1416                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1417                 {
1418                         rs->sr_err = LDAP_ASSERTION_FAILED;
1419                         goto return_results;
1420                 }
1421
1422
1423                 rs->sr_err = LDAP_COMPARE_FALSE;
1424
1425                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1426                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1427                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1428                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1429                 {
1430                         rs->sr_err = LDAP_COMPARE_TRUE;
1431                 }
1432
1433 return_results:;
1434
1435                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1436
1437                 send_ldap_result( op, rs );
1438
1439                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1440                         rs->sr_err = LDAP_SUCCESS;
1441                 }
1442                 rc = rs->sr_err;
1443         }
1444
1445         return rc;
1446 }
1447
1448 static int
1449 syncprov_op_mod( Operation *op, SlapReply *rs )
1450 {
1451         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1452         syncprov_info_t         *si = on->on_bi.bi_private;
1453
1454         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1455                 sizeof(opcookie) +
1456                 (si->si_ops ? sizeof(modinst) : 0 ),
1457                 op->o_tmpmemctx);
1458         opcookie *opc = (opcookie *)(cb+1);
1459         opc->son = on;
1460         cb->sc_response = syncprov_op_response;
1461         cb->sc_cleanup = syncprov_op_cleanup;
1462         cb->sc_private = opc;
1463         cb->sc_next = op->o_callback;
1464         op->o_callback = cb;
1465
1466         /* If there are active persistent searches, lock this operation.
1467          * See seqmod.c for the locking logic on its own.
1468          */
1469         if ( si->si_ops ) {
1470                 modtarget *mt, mtdummy;
1471                 modinst *mi;
1472
1473                 mi = (modinst *)(opc+1);
1474                 mi->mi_op = op;
1475
1476                 /* See if we're already modifying this entry... */
1477                 mtdummy.mt_op = op;
1478                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1479                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1480                 if ( mt ) {
1481                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1482                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1483                         mt->mt_tail->mi_next = mi;
1484                         mt->mt_tail = mi;
1485                         /* wait for this op to get to head of list */
1486                         while ( mt->mt_mods != mi ) {
1487                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1488                                 ldap_pvt_thread_yield();
1489                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1490
1491                                 /* clean up if the caller is giving up */
1492                                 if ( op->o_abandon ) {
1493                                         modinst *m2;
1494                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1495                                                 m2 = m2->mi_next );
1496                                         m2->mi_next = mi->mi_next;
1497                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1498                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1499                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1500                                         return SLAPD_ABANDON;
1501                                 }
1502                         }
1503                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1504                 } else {
1505                         /* Record that we're modifying this entry now */
1506                         mt = ch_malloc( sizeof(modtarget) );
1507                         mt->mt_mods = mi;
1508                         mt->mt_tail = mi;
1509                         mt->mt_op = mi->mi_op;
1510                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1511                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1512                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1513                 }
1514         }
1515
1516         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1517                 syncprov_matchops( op, opc, 1 );
1518
1519
1520         return SLAP_CB_CONTINUE;
1521 }
1522
1523 static int
1524 syncprov_op_extended( Operation *op, SlapReply *rs )
1525 {
1526         if ( exop_is_write( op ))
1527                 return syncprov_op_mod( op, rs );
1528
1529         return SLAP_CB_CONTINUE;
1530 }
1531
1532 typedef struct searchstate {
1533         slap_overinst *ss_on;
1534         syncops *ss_so;
1535         int ss_present;
1536 } searchstate;
1537
1538 static int
1539 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1540 {
1541         if ( rs->sr_ctrls ) {
1542                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1543                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1544                 rs->sr_ctrls = NULL;
1545         }
1546         return 0;
1547 }
1548
1549 static void
1550 syncprov_detach_op( Operation *op, syncops *so )
1551 {
1552         Operation *op2;
1553         int i, alen = 0;
1554         size_t size;
1555         char *ptr;
1556         GroupAssertion *g1, *g2;
1557
1558         /* count the search attrs */
1559         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1560                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1561         }
1562         /* Make a new copy of the operation */
1563         size = sizeof(Operation) + sizeof(Opheader) +
1564                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1565                 op->o_req_dn.bv_len + 1 +
1566                 op->o_req_ndn.bv_len + 1 +
1567                 op->o_ndn.bv_len + 1 +
1568                 so->s_filterstr.bv_len + 1;
1569         op2 = (Operation *)ch_calloc( 1, size );
1570         op2->o_hdr = (Opheader *)(op2+1);
1571
1572         /* Copy the fields we care about explicitly, leave the rest alone */
1573         *op2->o_hdr = *op->o_hdr;
1574         op2->o_tag = op->o_tag;
1575         op2->o_time = op->o_time;
1576         op2->o_bd = op->o_bd;
1577         op2->o_request = op->o_request;
1578
1579         if ( i ) {
1580                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1581                 ptr = (char *)(op2->ors_attrs+i+1);
1582                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1583                         op2->ors_attrs[i] = op->ors_attrs[i];
1584                         op2->ors_attrs[i].an_name.bv_val = ptr;
1585                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1586                 }
1587                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1588         } else {
1589                 ptr = (char *)(op2->o_hdr + 1);
1590         }
1591         op2->o_authz = op->o_authz;
1592         op2->o_ndn.bv_val = ptr;
1593         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1594         op2->o_dn = op2->o_ndn;
1595         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1596         op2->o_req_dn.bv_val = ptr;
1597         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1598         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1599         op2->o_req_ndn.bv_val = ptr;
1600         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1601         op2->ors_filterstr.bv_val = ptr;
1602         strcpy( ptr, so->s_filterstr.bv_val );
1603         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1604         op2->ors_filter = str2filter( ptr );
1605         so->s_op = op2;
1606
1607         /* Copy any cached group ACLs individually */
1608         op2->o_groups = NULL;
1609         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1610                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1611                 *g2 = *g1;
1612                 strcpy( g2->ga_ndn, g1->ga_ndn );
1613                 g2->ga_next = op2->o_groups;
1614                 op2->o_groups = g2;
1615         }
1616
1617         /* Add op2 to conn so abandon will find us */
1618         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1619         op->o_conn->c_n_ops_executing++;
1620         op->o_conn->c_n_ops_completed--;
1621         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1622         so->s_flags |= PS_IS_DETACHED;
1623         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1624 }
1625
1626 static int
1627 syncprov_search_response( Operation *op, SlapReply *rs )
1628 {
1629         searchstate *ss = op->o_callback->sc_private;
1630         slap_overinst *on = ss->ss_on;
1631         syncprov_info_t         *si = on->on_bi.bi_private;
1632         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1633
1634         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1635                 int i;
1636                 /* If we got a referral without a referral object, there's
1637                  * something missing that we cannot replicate. Just ignore it.
1638                  * The consumer will abort because we didn't send the expected
1639                  * control.
1640                  */
1641                 if ( !rs->sr_entry ) {
1642                         assert( rs->sr_entry );
1643                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1644                         return SLAP_CB_CONTINUE;
1645                 }
1646                 if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1647                         Attribute *a = attr_find( rs->sr_entry->e_attrs,
1648                                 slap_schema.si_ad_entryCSN );
1649
1650                         /* Don't send the ctx entry twice */
1651                         if ( a && bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1652                                 return LDAP_SUCCESS;
1653                 }
1654                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1655                         op->o_tmpmemctx );
1656                 rs->sr_ctrls[1] = NULL;
1657                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1658                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1659         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1660                 struct berval cookie;
1661
1662                 slap_compose_sync_cookie( op, &cookie,
1663                         &op->ors_filter->f_and->f_ava->aa_value,
1664                         srs->sr_state.rid );
1665
1666                 /* Is this a regular refresh? */
1667                 if ( !ss->ss_so ) {
1668                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1669                                 op->o_tmpmemctx );
1670                         rs->sr_ctrls[1] = NULL;
1671                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1672                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1673                                         LDAP_SYNC_REFRESH_DELETES );
1674                 } else {
1675                         int locked = 0;
1676                 /* It's RefreshAndPersist, transition to Persist phase */
1677                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1678                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1679                                 &cookie, 1, NULL, 0 );
1680                         /* Flush any queued persist messages */
1681                         if ( ss->ss_so->s_res ) {
1682                                 syncres *sr, *srnext;
1683                                 Entry *e;
1684                                 opcookie opc;
1685
1686                                 opc.son = on;
1687                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1688                                 locked = 1;
1689                                 for (sr = ss->ss_so->s_res; sr; sr=srnext) {
1690                                         int rc = LDAP_SUCCESS;
1691                                         srnext = sr->s_next;
1692                                         opc.sdn = sr->s_dn;
1693                                         opc.sndn = sr->s_ndn;
1694                                         opc.suuid = sr->s_uuid;
1695                                         opc.sctxcsn = sr->s_csn;
1696                                         opc.sreference = sr->s_isreference;
1697                                         e = NULL;
1698
1699                                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
1700                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1701                                                 rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
1702                                                 op->o_bd->bd_info = (BackendInfo *)on;
1703                                         }
1704                                         if ( rc == LDAP_SUCCESS )
1705                                                 syncprov_sendresp( op, &opc, ss->ss_so, e,
1706                                                         sr->s_mode, 0 );
1707
1708                                         if ( e ) {
1709                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1710                                                 be_entry_release_rw( op, e, 0 );
1711                                                 op->o_bd->bd_info = (BackendInfo *)on;
1712                                         }
1713                                         ch_free( sr );
1714                                 }
1715                                 ss->ss_so->s_res = NULL;
1716                                 ss->ss_so->s_restail = NULL;
1717                         }
1718
1719                         /* Turn off the refreshing flag */
1720                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1721                         if ( locked )
1722                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1723
1724                         /* Detach this Op from frontend control */
1725                         syncprov_detach_op( op, ss->ss_so );
1726
1727                         return LDAP_SUCCESS;
1728                 }
1729         }
1730
1731         return SLAP_CB_CONTINUE;
1732 }
1733
1734 static int
1735 syncprov_op_search( Operation *op, SlapReply *rs )
1736 {
1737         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1738         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1739         slap_callback   *cb;
1740         int gotstate = 0, nochange = 0, do_present = 1;
1741         Filter *fand, *fava;
1742         syncops *sop = NULL;
1743         searchstate *ss;
1744         sync_control *srs;
1745         struct berval ctxcsn;
1746         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1747
1748         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1749
1750         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1751                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1752                 return rs->sr_err;
1753         }
1754
1755         srs = op->o_controls[slap_cids.sc_LDAPsync];
1756
1757         /* If this is a persistent search, set it up right away */
1758         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1759                 syncops so = {0};
1760                 fbase_cookie fc;
1761                 opcookie opc;
1762                 slap_callback sc;
1763
1764                 fc.fss = &so;
1765                 fc.fbase = 0;
1766                 so.s_eid = NOID;
1767                 so.s_op = op;
1768                 so.s_flags = PS_IS_REFRESHING;
1769                 /* syncprov_findbase expects to be called as a callback... */
1770                 sc.sc_private = &opc;
1771                 opc.son = on;
1772                 cb = op->o_callback;
1773                 op->o_callback = &sc;
1774                 rs->sr_err = syncprov_findbase( op, &fc );
1775                 op->o_callback = cb;
1776
1777                 if ( rs->sr_err != LDAP_SUCCESS ) {
1778                         send_ldap_result( op, rs );
1779                         return rs->sr_err;
1780                 }
1781                 sop = ch_malloc( sizeof( syncops ));
1782                 *sop = so;
1783                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1784                 sop->s_rid = srs->sr_state.rid;
1785                 sop->s_inuse = 1;
1786
1787                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1788                 sop->s_next = si->si_ops;
1789                 si->si_ops = sop;
1790                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1791         }
1792
1793         /* snapshot the ctxcsn */
1794         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1795         strcpy( csnbuf, si->si_ctxcsnbuf );
1796         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1797         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1798         ctxcsn.bv_val = csnbuf;
1799
1800         /* If we have a cookie, handle the PRESENT lookups */
1801         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1802                 sessionlog *sl;
1803
1804                 /* The cookie was validated when it was parsed, just use it */
1805
1806                 /* If just Refreshing and nothing has changed, shortcut it */
1807                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1808                         nochange = 1;
1809                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1810                                 LDAPControl     *ctrls[2];
1811
1812                                 ctrls[0] = NULL;
1813                                 ctrls[1] = NULL;
1814                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1815                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1816                                 rs->sr_ctrls = ctrls;
1817                                 rs->sr_err = LDAP_SUCCESS;
1818                                 send_ldap_result( op, rs );
1819                                 rs->sr_ctrls = NULL;
1820                                 return rs->sr_err;
1821                         }
1822                         goto shortcut;
1823                 }
1824                 /* Do we have a sessionlog for this search? */
1825                 sl=si->si_logs;
1826                 if ( sl ) {
1827                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1828                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1829                                 do_present = 0;
1830                                 /* mutex is unlocked in playlog */
1831                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1832                         } else {
1833                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1834                         }
1835                 }
1836                 /* Is the CSN still present in the database? */
1837                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1838                         /* No, so a reload is required */
1839 #if 0           /* the consumer doesn't seem to send this hint */
1840                         if ( op->o_sync_rhint == 0 ) {
1841                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1842                                 return rs->sr_err;
1843                         }
1844 #endif
1845                 } else {
1846                         gotstate = 1;
1847                         /* If changed and doing Present lookup, send Present UUIDs */
1848                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1849                                 LDAP_SUCCESS ) {
1850                                 send_ldap_result( op, rs );
1851                                 return rs->sr_err;
1852                         }
1853                 }
1854         }
1855
1856 shortcut:
1857         /* Append CSN range to search filter, save original filter
1858          * for persistent search evaluation
1859          */
1860         if ( sop ) {
1861                 sop->s_filterstr= op->ors_filterstr;
1862         }
1863
1864         fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1865         fand->f_choice = LDAP_FILTER_AND;
1866         fand->f_next = NULL;
1867         fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1868         fava->f_choice = LDAP_FILTER_LE;
1869         fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1870         fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1871         ber_dupbv_x( &fava->f_ava->aa_value, &ctxcsn, op->o_tmpmemctx );
1872         fand->f_and = fava;
1873         if ( gotstate ) {
1874                 fava->f_next = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1875                 fava = fava->f_next;
1876                 fava->f_choice = LDAP_FILTER_GE;
1877                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1878                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1879                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1880         }
1881         fava->f_next = op->ors_filter;
1882         op->ors_filter = fand;
1883         filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1884
1885         /* Let our callback add needed info to returned entries */
1886         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1887         ss = (searchstate *)(cb+1);
1888         ss->ss_on = on;
1889         ss->ss_so = sop;
1890         ss->ss_present = do_present;
1891         cb->sc_response = syncprov_search_response;
1892         cb->sc_cleanup = syncprov_search_cleanup;
1893         cb->sc_private = ss;
1894         cb->sc_next = op->o_callback;
1895         op->o_callback = cb;
1896
1897 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
1898         op->o_sync_mode &= SLAP_CONTROL_MASK;
1899 #endif
1900
1901         /* If this is a persistent search and no changes were reported during
1902          * the refresh phase, just invoke the response callback to transition
1903          * us into persist phase
1904          */
1905         if ( nochange ) {
1906                 rs->sr_err = LDAP_SUCCESS;
1907                 rs->sr_nentries = 0;
1908                 send_ldap_result( op, rs );
1909                 return rs->sr_err;
1910         }
1911         return SLAP_CB_CONTINUE;
1912 }
1913
1914 static int
1915 syncprov_operational(
1916         Operation *op,
1917         SlapReply *rs )
1918 {
1919         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1920         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1921
1922         if ( rs->sr_entry &&
1923                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
1924
1925                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
1926                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
1927                         Attribute *a, **ap = NULL;
1928
1929                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
1930                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
1931                                         break;
1932                         }
1933
1934                         if ( !a ) {
1935                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
1936
1937                                 a = ch_malloc( sizeof(Attribute));
1938                                 a->a_desc = slap_schema.si_ad_contextCSN;
1939                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
1940                                 a->a_vals[1].bv_val = NULL;
1941                                 a->a_nvals = a->a_vals;
1942                                 a->a_next = NULL;
1943                                 a->a_flags = 0;
1944                                 *ap = a;
1945                         }
1946
1947                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1948                         if ( !ap ) {
1949                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
1950                         } else {
1951                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
1952                         }
1953                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1954                 }
1955         }
1956         return SLAP_CB_CONTINUE;
1957 }
1958
1959 static int
1960 syncprov_db_config(
1961         BackendDB       *be,
1962         const char      *fname,
1963         int             lineno,
1964         int             argc,
1965         char    **argv
1966 )
1967 {
1968         slap_overinst           *on = (slap_overinst *)be->bd_info;
1969         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1970
1971         if ( strcasecmp( argv[ 0 ], "syncprov-checkpoint" ) == 0 ) {
1972                 if ( argc != 3 ) {
1973                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
1974                                 "\"syncprov-checkpoint <ops> <minutes>\"\n", fname, lineno );
1975                         return -1;
1976                 }
1977                 si->si_chkops = atoi( argv[1] );
1978                 si->si_chktime = atoi( argv[2] ) * 60;
1979                 return 0;
1980
1981         } else if ( strcasecmp( argv[0], "syncprov-sessionlog" ) == 0 ) {
1982                 sessionlog *sl;
1983                 int size;
1984                 if ( argc != 2 ) {
1985                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
1986                                 "\"syncprov-sessionlog <size>\"\n", fname, lineno );
1987                         return -1;
1988                 }
1989                 size = atoi( argv[1] );
1990                 if ( size < 0 ) {
1991                         fprintf( stderr,
1992                                 "%s: line %d: session log size %d is negative\n",
1993                                 fname, lineno, size );
1994                         return -1;
1995                 }
1996                 sl = si->si_logs;
1997                 if ( !sl ) {
1998                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
1999                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2000                         sl->sl_mincsn.bv_len = 0;
2001                         sl->sl_num = 0;
2002                         sl->sl_head = sl->sl_tail = NULL;
2003                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2004                         si->si_logs = sl;
2005                 }
2006                 sl->sl_size = size;
2007                 return 0;
2008         }
2009
2010         return SLAP_CONF_UNKNOWN;
2011 }
2012
2013 /* Cheating - we have no thread pool context for these functions,
2014  * so make one.
2015  */
2016 typedef struct thread_keys {
2017         void *key;
2018         void *data;
2019         ldap_pvt_thread_pool_keyfree_t *xfree;
2020 } thread_keys;
2021
2022 #define MAXKEYS 32
2023 /* A fake thread context */
2024 static thread_keys thrctx[MAXKEYS];
2025
2026 /* Read any existing contextCSN from the underlying db.
2027  * Then search for any entries newer than that. If no value exists,
2028  * just generate it. Cache whatever result.
2029  */
2030 static int
2031 syncprov_db_open(
2032     BackendDB *be
2033 )
2034 {
2035         slap_overinst   *on = (slap_overinst *) be->bd_info;
2036         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2037
2038         Connection conn;
2039         char opbuf[OPERATION_BUFFER_SIZE];
2040         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2041         Operation *op = (Operation *)opbuf;
2042         Entry *e;
2043         Attribute *a;
2044         int rc;
2045
2046         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2047         if ( rc ) {
2048                 return rc;
2049         }
2050
2051         connection_fake_init( &conn, op, thrctx );
2052         op->o_bd = be;
2053         op->o_dn = be->be_rootdn;
2054         op->o_ndn = be->be_rootndn;
2055
2056         ctxcsnbuf[0] = '\0';
2057
2058         op->o_bd->bd_info = on->on_info->oi_orig;
2059         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2060                 slap_schema.si_ad_contextCSN, 0, &e );
2061
2062         if ( e ) {
2063                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2064                 if ( a ) {
2065                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2066                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2067                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2068                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2069                                 si->si_ctxcsn.bv_len );
2070                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2071                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2072                 }
2073                 be_entry_release_rw( op, e, 0 );
2074                 op->o_bd->bd_info = (BackendInfo *)on;
2075                 op->o_req_dn = be->be_suffix[0];
2076                 op->o_req_ndn = be->be_nsuffix[0];
2077                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2078                 syncprov_findcsn( op, FIND_MAXCSN );
2079         }
2080
2081         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2082                 slap_get_csn( op, si->si_ctxcsnbuf, sizeof(si->si_ctxcsnbuf),
2083                                 &si->si_ctxcsn, 0 );
2084         }
2085
2086         /* If our ctxcsn is different from what was read from the root
2087          * entry, write the new value out.
2088          */
2089         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2090                 SlapReply rs = {REP_RESULT};
2091                 syncprov_checkpoint( op, &rs, on );
2092         }
2093
2094         op->o_bd->bd_info = (BackendInfo *)on;
2095         return 0;
2096 }
2097
2098 /* Write the current contextCSN into the underlying db.
2099  */
2100 static int
2101 syncprov_db_close(
2102     BackendDB *be
2103 )
2104 {
2105     slap_overinst   *on = (slap_overinst *) be->bd_info;
2106     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2107         int i;
2108
2109         if ( si->si_numops ) {
2110                 Connection conn;
2111                 char opbuf[OPERATION_BUFFER_SIZE];
2112                 Operation *op = (Operation *)opbuf;
2113                 SlapReply rs = {REP_RESULT};
2114
2115                 connection_fake_init( &conn, op, thrctx );
2116                 op->o_bd = be;
2117                 op->o_dn = be->be_rootdn;
2118                 op->o_ndn = be->be_rootndn;
2119                 syncprov_checkpoint( op, &rs, on );
2120         }
2121         for ( i=0; thrctx[i].key; i++) {
2122                 if ( thrctx[i].xfree )
2123                         thrctx[i].xfree( thrctx[i].key, thrctx[i].data );
2124                 thrctx[i].key = NULL;
2125         }
2126
2127     return 0;
2128 }
2129
2130 static int
2131 syncprov_db_init(
2132         BackendDB *be
2133 )
2134 {
2135         slap_overinst   *on = (slap_overinst *)be->bd_info;
2136         syncprov_info_t *si;
2137
2138         si = ch_calloc(1, sizeof(syncprov_info_t));
2139         on->on_bi.bi_private = si;
2140         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2141         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2142         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2143         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2144
2145         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2146         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2147
2148         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2149         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2150
2151         return 0;
2152 }
2153
2154 static int
2155 syncprov_db_destroy(
2156         BackendDB *be
2157 )
2158 {
2159         slap_overinst   *on = (slap_overinst *)be->bd_info;
2160         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2161
2162         if ( si ) {
2163                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2164                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2165                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2166                 ch_free( si );
2167         }
2168
2169         return 0;
2170 }
2171
2172 static int syncprov_parseCtrl (
2173         Operation *op,
2174         SlapReply *rs,
2175         LDAPControl *ctrl )
2176 {
2177         ber_tag_t tag;
2178         BerElement *ber;
2179         ber_int_t mode;
2180         ber_len_t len;
2181         struct berval cookie = BER_BVNULL;
2182         sync_control *sr;
2183         int rhint = 0;
2184
2185         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2186                 rs->sr_text = "Sync control specified multiple times";
2187                 return LDAP_PROTOCOL_ERROR;
2188         }
2189
2190         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2191                 rs->sr_text = "Sync control specified with pagedResults control";
2192                 return LDAP_PROTOCOL_ERROR;
2193         }
2194
2195         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2196                 rs->sr_text = "Sync control value is empty (or absent)";
2197                 return LDAP_PROTOCOL_ERROR;
2198         }
2199
2200         /* Parse the control value
2201          *      syncRequestValue ::= SEQUENCE {
2202          *              mode   ENUMERATED {
2203          *                      -- 0 unused
2204          *                      refreshOnly             (1),
2205          *                      -- 2 reserved
2206          *                      refreshAndPersist       (3)
2207          *              },
2208          *              cookie  syncCookie OPTIONAL
2209          *      }
2210          */
2211
2212         ber = ber_init( &ctrl->ldctl_value );
2213         if( ber == NULL ) {
2214                 rs->sr_text = "internal error";
2215                 return LDAP_OTHER;
2216         }
2217
2218         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2219                 rs->sr_text = "Sync control : mode decoding error";
2220                 return LDAP_PROTOCOL_ERROR;
2221         }
2222
2223         switch( mode ) {
2224         case LDAP_SYNC_REFRESH_ONLY:
2225                 mode = SLAP_SYNC_REFRESH;
2226                 break;
2227         case LDAP_SYNC_REFRESH_AND_PERSIST:
2228                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2229                 break;
2230         default:
2231                 rs->sr_text = "Sync control : unknown update mode";
2232                 return LDAP_PROTOCOL_ERROR;
2233         }
2234
2235         tag = ber_peek_tag( ber, &len );
2236
2237         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2238                 if (( ber_scanf( ber, /*{*/ "o", &cookie )) == LBER_ERROR ) {
2239                         rs->sr_text = "Sync control : cookie decoding error";
2240                         return LDAP_PROTOCOL_ERROR;
2241                 }
2242         }
2243         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2244                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2245                         rs->sr_text = "Sync control : rhint decoding error";
2246                         return LDAP_PROTOCOL_ERROR;
2247                 }
2248         }
2249         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2250                         rs->sr_text = "Sync control : decoding error";
2251                         return LDAP_PROTOCOL_ERROR;
2252         }
2253         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2254         sr->sr_rhint = rhint;
2255         if (!BER_BVISNULL(&cookie)) {
2256                 ber_dupbv( &sr->sr_state.octet_str, &cookie );
2257                 slap_parse_sync_cookie( &sr->sr_state );
2258         }
2259
2260         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2261
2262         (void) ber_free( ber, 1 );
2263
2264         op->o_sync = ctrl->ldctl_iscritical
2265                 ? SLAP_CONTROL_CRITICAL
2266                 : SLAP_CONTROL_NONCRITICAL;
2267
2268         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2269
2270         return LDAP_SUCCESS;
2271 }
2272
2273 /* This overlay is set up for dynamic loading via moduleload. For static
2274  * configuration, you'll need to arrange for the slap_overinst to be
2275  * initialized and registered by some other function inside slapd.
2276  */
2277
2278 static slap_overinst            syncprov;
2279
2280 int
2281 syncprov_init()
2282 {
2283         int rc;
2284
2285         rc = register_supported_control( LDAP_CONTROL_SYNC,
2286                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2287                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2288         if ( rc != LDAP_SUCCESS ) {
2289                 fprintf( stderr, "Failed to register control %d\n", rc );
2290                 return rc;
2291         }
2292
2293         syncprov.on_bi.bi_type = "syncprov";
2294         syncprov.on_bi.bi_db_init = syncprov_db_init;
2295         syncprov.on_bi.bi_db_config = syncprov_db_config;
2296         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2297         syncprov.on_bi.bi_db_open = syncprov_db_open;
2298         syncprov.on_bi.bi_db_close = syncprov_db_close;
2299
2300         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2301         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2302
2303         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2304         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2305         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2306         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2307         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2308         syncprov.on_bi.bi_op_search = syncprov_op_search;
2309         syncprov.on_bi.bi_extended = syncprov_op_extended;
2310         syncprov.on_bi.bi_operational = syncprov_operational;
2311
2312         return overlay_register( &syncprov );
2313 }
2314
2315 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2316 int
2317 init_module( int argc, char *argv[] )
2318 {
2319         return syncprov_init();
2320 }
2321 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2322
2323 #endif /* defined(SLAPD_OVER_SYNCPROV) */