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 2004-2007 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 /* A modify request on a particular entry */
  32 typedef struct modinst {
  33         struct modinst *mi_next;
  34         Operation *mi_op;
  35 } modinst;
  36
  37 typedef struct modtarget {
  38         struct modinst *mt_mods;
  39         struct modinst *mt_tail;
  40         Operation *mt_op;
  41         ldap_pvt_thread_mutex_t mt_mutex;
  42 } modtarget;
  43
  44 /* A queued result of a persistent search */
  45 typedef struct syncres {
  46         struct syncres *s_next;
  47         struct berval s_dn;
  48         struct berval s_ndn;
  49         struct berval s_uuid;
  50         struct berval s_csn;
  51         char s_mode;
  52         char s_isreference;
  53 } syncres;
  54
  55 /* Record of a persistent search */
  56 typedef struct syncops {
  57         struct syncops *s_next;
  58         struct berval   s_base;         /* ndn of search base */
  59         ID              s_eid;          /* entryID of search base */
  60         Operation       *s_op;          /* search op */
  61         int             s_rid;
  62         int             s_sid;
  63         struct berval s_filterstr;
  64         int             s_flags;        /* search status */
  65 #define PS_IS_REFRESHING        0x01
  66 #define PS_IS_DETACHED          0x02
  67 #define PS_WROTE_BASE           0x04
  68 #define PS_FIND_BASE            0x08
  69 #define PS_FIX_FILTER           0x10
  70
  71         int             s_inuse;        /* reference count */
  72         struct syncres *s_res;
  73         struct syncres *s_restail;
  74         struct re_s     *s_qtask;       /* task for playing psearch responses */
  75 #define RUNQ_INTERVAL   36000   /* a long time */
  76         ldap_pvt_thread_mutex_t s_mutex;
  77 } syncops;
  78
  79 /* A received sync control */
  80 typedef struct sync_control {
  81         struct sync_cookie sr_state;
  82         int sr_rhint;
  83 } sync_control;
  84
  85 #if 0 /* moved back to slap.h */
  86 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  87 #endif
  88 /* o_sync_mode uses data bits of o_sync */
  89 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  90
  91 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  93 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  94 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  95
  96 /* Record of which searches matched at premodify step */
  97 typedef struct syncmatches {
  98         struct syncmatches *sm_next;
  99         syncops *sm_op;
 100 } syncmatches;
 101
 102 /* Session log data */
 103 typedef struct slog_entry {
 104         struct slog_entry *se_next;
 105         struct berval se_uuid;
 106         struct berval se_csn;
 107         int     se_sid;
 108         ber_tag_t       se_tag;
 109 } slog_entry;
 110
 111 typedef struct sessionlog {
 112         struct berval   sl_mincsn;
 113         int             sl_num;
 114         int             sl_size;
 115         slog_entry *sl_head;
 116         slog_entry *sl_tail;
 117         ldap_pvt_thread_mutex_t sl_mutex;
 118 } sessionlog;
 119
 120 /* The main state for this overlay */
 121 typedef struct syncprov_info_t {
 122         syncops         *si_ops;
 123         BerVarray       si_ctxcsn;      /* ldapsync context */
 124         int             *si_sids;
 125         int             si_numcsns;
 126         int             si_chkops;      /* checkpointing info */
 127         int             si_chktime;
 128         int             si_numops;      /* number of ops since last checkpoint */
 129         int             si_nopres;      /* Skip present phase */
 130         int             si_usehint;     /* use reload hint */
 131         time_t  si_chklast;     /* time of last checkpoint */
 132         Avlnode *si_mods;       /* entries being modified */
 133         sessionlog      *si_logs;
 134         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 135         ldap_pvt_thread_mutex_t si_ops_mutex;
 136         ldap_pvt_thread_mutex_t si_mods_mutex;
 137 } syncprov_info_t;
 138
 139 typedef struct opcookie {
 140         slap_overinst *son;
 141         syncmatches *smatches;
 142         struct berval sdn;      /* DN of entry, for deletes */
 143         struct berval sndn;
 144         struct berval suuid;    /* UUID of entry */
 145         struct berval sctxcsn;
 146         int sreference; /* Is the entry a reference? */
 147 } opcookie;
 148
 149 typedef struct fbase_cookie {
 150         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 151         syncops *fss;   /* persistent search we're testing against */
 152         int fbase;      /* if TRUE we found the search base and it's still valid */
 153         int fscope;     /* if TRUE then fdn is within the psearch scope */
 154 } fbase_cookie;
 155
 156 static AttributeName csn_anlist[3];
 157 static AttributeName uuid_anlist[2];
 158
 159 /* Build a LDAPsync intermediate state control */
 160 static int
 161 syncprov_state_ctrl(
 162         Operation       *op,
 163         SlapReply       *rs,
 164         Entry           *e,
 165         int             entry_sync_state,
 166         LDAPControl     **ctrls,
 167         int             num_ctrls,
 168         int             send_cookie,
 169         struct berval   *cookie )
 170 {
 171         Attribute* a;
 172         int ret;
 173
 174         BerElementBuffer berbuf;
 175         BerElement *ber = (BerElement *)&berbuf;
 176
 177         struct berval   entryuuid_bv = BER_BVNULL;
 178
 179         ber_init2( ber, 0, LBER_USE_DER );
 180         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 181
 182         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 183
 184         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 185                 AttributeDescription *desc = a->a_desc;
 186                 if ( desc == slap_schema.si_ad_entryUUID ) {
 187                         entryuuid_bv = a->a_nvals[0];
 188                         break;
 189                 }
 190         }
 191
 192         /* FIXME: what if entryuuid is NULL or empty ? */
 193
 194         if ( send_cookie && cookie ) {
 195                 ber_printf( ber, "{eOON}",
 196                         entry_sync_state, &entryuuid_bv, cookie );
 197         } else {
 198                 ber_printf( ber, "{eON}",
 199                         entry_sync_state, &entryuuid_bv );
 200         }
 201
 202         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 203         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 204         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 205
 206         ber_free_buf( ber );
 207
 208         if ( ret < 0 ) {
 209                 Debug( LDAP_DEBUG_TRACE,
 210                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 211                         0, 0, 0 );
 212                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 213                 return ret;
 214         }
 215
 216         return LDAP_SUCCESS;
 217 }
 218
 219 /* Build a LDAPsync final state control */
 220 static int
 221 syncprov_done_ctrl(
 222         Operation       *op,
 223         SlapReply       *rs,
 224         LDAPControl     **ctrls,
 225         int                     num_ctrls,
 226         int                     send_cookie,
 227         struct berval *cookie,
 228         int                     refreshDeletes )
 229 {
 230         int ret;
 231         BerElementBuffer berbuf;
 232         BerElement *ber = (BerElement *)&berbuf;
 233
 234         ber_init2( ber, NULL, LBER_USE_DER );
 235         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 236
 237         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 238
 239         ber_printf( ber, "{" );
 240         if ( send_cookie && cookie ) {
 241                 ber_printf( ber, "O", cookie );
 242         }
 243         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 244                 ber_printf( ber, "b", refreshDeletes );
 245         }
 246         ber_printf( ber, "N}" );
 247
 248         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 249         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 250         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 251
 252         ber_free_buf( ber );
 253
 254         if ( ret < 0 ) {
 255                 Debug( LDAP_DEBUG_TRACE,
 256                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 257                         0, 0, 0 );
 258                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 259                 return ret;
 260         }
 261
 262         return LDAP_SUCCESS;
 263 }
 264
 265 static int
 266 syncprov_sendinfo(
 267         Operation       *op,
 268         SlapReply       *rs,
 269         int                     type,
 270         struct berval *cookie,
 271         int                     refreshDone,
 272         BerVarray       syncUUIDs,
 273         int                     refreshDeletes )
 274 {
 275         BerElementBuffer berbuf;
 276         BerElement *ber = (BerElement *)&berbuf;
 277         struct berval rspdata;
 278
 279         int ret;
 280
 281         ber_init2( ber, NULL, LBER_USE_DER );
 282         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 283
 284         if ( type ) {
 285                 switch ( type ) {
 286                 case LDAP_TAG_SYNC_NEW_COOKIE:
 287                         ber_printf( ber, "tO", type, cookie );
 288                         break;
 289                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 290                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 291                         ber_printf( ber, "t{", type );
 292                         if ( cookie ) {
 293                                 ber_printf( ber, "O", cookie );
 294                         }
 295                         if ( refreshDone == 0 ) {
 296                                 ber_printf( ber, "b", refreshDone );
 297                         }
 298                         ber_printf( ber, "N}" );
 299                         break;
 300                 case LDAP_TAG_SYNC_ID_SET:
 301                         ber_printf( ber, "t{", type );
 302                         if ( cookie ) {
 303                                 ber_printf( ber, "O", cookie );
 304                         }
 305                         if ( refreshDeletes == 1 ) {
 306                                 ber_printf( ber, "b", refreshDeletes );
 307                         }
 308                         ber_printf( ber, "[W]", syncUUIDs );
 309                         ber_printf( ber, "N}" );
 310                         break;
 311                 default:
 312                         Debug( LDAP_DEBUG_TRACE,
 313                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 314                                 type, 0, 0 );
 315                         return LDAP_OTHER;
 316                 }
 317         }
 318
 319         ret = ber_flatten2( ber, &rspdata, 0 );
 320
 321         if ( ret < 0 ) {
 322                 Debug( LDAP_DEBUG_TRACE,
 323                         "syncprov_sendinfo: ber_flatten2 failed\n",
 324                         0, 0, 0 );
 325                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 326                 return ret;
 327         }
 328
 329         rs->sr_rspoid = LDAP_SYNC_INFO;
 330         rs->sr_rspdata = &rspdata;
 331         send_ldap_intermediate( op, rs );
 332         rs->sr_rspdata = NULL;
 333         ber_free_buf( ber );
 334
 335         return LDAP_SUCCESS;
 336 }
 337
 338 /* Find a modtarget in an AVL tree */
 339 static int
 340 sp_avl_cmp( const void *c1, const void *c2 )
 341 {
 342         const modtarget *m1, *m2;
 343         int rc;
 344
 345         m1 = c1; m2 = c2;
 346         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 347
 348         if ( rc ) return rc;
 349         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 350 }
 351
 352 /* syncprov_findbase:
 353  *   finds the true DN of the base of a search (with alias dereferencing) and
 354  * checks to make sure the base entry doesn't get replaced with a different
 355  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 356  * change is detected, any persistent search on this base must be terminated /
 357  * reloaded.
 358  *   On the first call, we just save the DN and entryID. On subsequent calls
 359  * we compare the DN and entryID with the saved values.
 360  */
 361 static int
 362 findbase_cb( Operation *op, SlapReply *rs )
 363 {
 364         slap_callback *sc = op->o_callback;
 365
 366         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 367                 fbase_cookie *fc = sc->sc_private;
 368
 369                 /* If no entryID, we're looking for the first time.
 370                  * Just store whatever we got.
 371                  */
 372                 if ( fc->fss->s_eid == NOID ) {
 373                         fc->fbase = 2;
 374                         fc->fss->s_eid = rs->sr_entry->e_id;
 375                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 376
 377                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 378                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 379
 380                 /* OK, the DN is the same and the entryID is the same. */
 381                         fc->fbase = 1;
 382                 }
 383         }
 384         if ( rs->sr_err != LDAP_SUCCESS ) {
 385                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 386         }
 387         return LDAP_SUCCESS;
 388 }
 389
 390 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 391 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 392
 393 static int
 394 syncprov_findbase( Operation *op, fbase_cookie *fc )
 395 {
 396         opcookie *opc = op->o_callback->sc_private;
 397         slap_overinst *on = opc->son;
 398
 399         /* Use basic parameters from syncrepl search, but use
 400          * current op's threadctx / tmpmemctx
 401          */
 402         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 403         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 404                 slap_callback cb = {0};
 405                 Operation fop;
 406                 SlapReply frs = { REP_RESULT };
 407                 BackendInfo *bi;
 408                 int rc;
 409
 410                 fc->fss->s_flags ^= PS_FIND_BASE;
 411                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 412
 413                 fop = *fc->fss->s_op;
 414
 415                 fop.o_hdr = op->o_hdr;
 416                 fop.o_bd = op->o_bd;
 417                 fop.o_time = op->o_time;
 418                 fop.o_tincr = op->o_tincr;
 419                 bi = op->o_bd->bd_info;
 420
 421                 cb.sc_response = findbase_cb;
 422                 cb.sc_private = fc;
 423
 424                 fop.o_sync_mode = 0;    /* turn off sync mode */
 425                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 426                 fop.o_callback = &cb;
 427                 fop.o_tag = LDAP_REQ_SEARCH;
 428                 fop.ors_scope = LDAP_SCOPE_BASE;
 429                 fop.ors_limit = NULL;
 430                 fop.ors_slimit = 1;
 431                 fop.ors_tlimit = SLAP_NO_LIMIT;
 432                 fop.ors_attrs = slap_anlist_no_attrs;
 433                 fop.ors_attrsonly = 1;
 434                 fop.ors_filter = &generic_filter;
 435                 fop.ors_filterstr = generic_filterstr;
 436
 437                 rc = overlay_op_walk( &fop, &frs, op_search, on->on_info, on );
 438                 op->o_bd->bd_info = bi;
 439         } else {
 440                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 441                 fc->fbase = 1;
 442         }
 443
 444         /* After the first call, see if the fdn resides in the scope */
 445         if ( fc->fbase == 1 ) {
 446                 switch ( fc->fss->s_op->ors_scope ) {
 447                 case LDAP_SCOPE_BASE:
 448                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 449                         break;
 450                 case LDAP_SCOPE_ONELEVEL: {
 451                         struct berval pdn;
 452                         dnParent( fc->fdn, &pdn );
 453                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 454                         break; }
 455                 case LDAP_SCOPE_SUBTREE:
 456                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 457                         break;
 458                 case LDAP_SCOPE_SUBORDINATE:
 459                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 460                                 !dn_match( fc->fdn, &fc->fss->s_base );
 461                         break;
 462                 }
 463         }
 464
 465         if ( fc->fbase )
 466                 return LDAP_SUCCESS;
 467
 468         /* If entryID has changed, then the base of this search has
 469          * changed. Invalidate the psearch.
 470          */
 471         return LDAP_NO_SUCH_OBJECT;
 472 }
 473
 474 /* syncprov_findcsn:
 475  *   This function has three different purposes, but they all use a search
 476  * that filters on entryCSN so they're combined here.
 477  * 1: at startup time, after a contextCSN has been read from the database,
 478  * we search for all entries with CSN >= contextCSN in case the contextCSN
 479  * was not checkpointed at the previous shutdown.
 480  *
 481  * 2: when the current contextCSN is known and we have a sync cookie, we search
 482  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 483  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 484  *
 485  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 486  * CSN, and generate Present records for them. We always collect this result
 487  * in SyncID sets, even if there's only one match.
 488  */
 489 typedef enum find_csn_t {
 490         FIND_MAXCSN     = 1,
 491         FIND_CSN        = 2,
 492         FIND_PRESENT    = 3
 493 } find_csn_t;
 494
 495 static int
 496 findmax_cb( Operation *op, SlapReply *rs )
 497 {
 498         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 499                 struct berval *maxcsn = op->o_callback->sc_private;
 500                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 501                         slap_schema.si_ad_entryCSN );
 502
 503                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 504                         maxcsn->bv_len = a->a_vals[0].bv_len;
 505                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 506                 }
 507         }
 508         return LDAP_SUCCESS;
 509 }
 510
 511 static int
 512 findcsn_cb( Operation *op, SlapReply *rs )
 513 {
 514         slap_callback *sc = op->o_callback;
 515
 516         /* We just want to know that at least one exists, so it's OK if
 517          * we exceed the unchecked limit.
 518          */
 519         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 520                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 521                 sc->sc_private = (void *)1;
 522         }
 523         return LDAP_SUCCESS;
 524 }
 525
 526 /* Build a list of entryUUIDs for sending in a SyncID set */
 527
 528 #define UUID_LEN        16
 529
 530 typedef struct fpres_cookie {
 531         int num;
 532         BerVarray uuids;
 533         char *last;
 534 } fpres_cookie;
 535
 536 static int
 537 findpres_cb( Operation *op, SlapReply *rs )
 538 {
 539         slap_callback *sc = op->o_callback;
 540         fpres_cookie *pc = sc->sc_private;
 541         Attribute *a;
 542         int ret = SLAP_CB_CONTINUE;
 543
 544         switch ( rs->sr_type ) {
 545         case REP_SEARCH:
 546                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 547                 if ( a ) {
 548                         pc->uuids[pc->num].bv_val = pc->last;
 549                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 550                                 pc->uuids[pc->num].bv_len );
 551                         pc->num++;
 552                         pc->last = pc->uuids[pc->num].bv_val;
 553                         pc->uuids[pc->num].bv_val = NULL;
 554                 }
 555                 ret = LDAP_SUCCESS;
 556                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 557                         break;
 558                 /* FALLTHRU */
 559         case REP_RESULT:
 560                 ret = rs->sr_err;
 561                 if ( pc->num ) {
 562                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 563                                 0, pc->uuids, 0 );
 564                         pc->uuids[pc->num].bv_val = pc->last;
 565                         pc->num = 0;
 566                         pc->last = pc->uuids[0].bv_val;
 567                 }
 568                 break;
 569         default:
 570                 break;
 571         }
 572         return ret;
 573 }
 574
 575 static int
 576 syncprov_findcsn( Operation *op, find_csn_t mode )
 577 {
 578         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 579         syncprov_info_t         *si = on->on_bi.bi_private;
 580
 581         slap_callback cb = {0};
 582         Operation fop;
 583         SlapReply frs = { REP_RESULT };
 584         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 585         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 586         struct berval maxcsn;
 587         Filter cf;
 588 #ifdef LDAP_COMP_MATCH
 589         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 590 #else
 591         AttributeAssertion eq = { NULL, BER_BVNULL };
 592 #endif
 593         fpres_cookie pcookie;
 594         sync_control *srs = NULL;
 595         struct slap_limits_set fc_limits;
 596         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 597         int maxid = 0;
 598
 599         if ( mode != FIND_MAXCSN ) {
 600                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 601         }
 602
 603         fop = *op;
 604         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 605         /* We want pure entries, not referrals */
 606         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 607
 608         cf.f_ava = &eq;
 609         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 610         BER_BVZERO( &cf.f_av_value );
 611         cf.f_next = NULL;
 612
 613         fop.o_callback = &cb;
 614         fop.ors_limit = NULL;
 615         fop.ors_tlimit = SLAP_NO_LIMIT;
 616         fop.ors_filter = &cf;
 617         fop.ors_filterstr.bv_val = buf;
 618
 619 again:
 620         switch( mode ) {
 621         case FIND_MAXCSN:
 622                 cf.f_choice = LDAP_FILTER_GE;
 623                 cf.f_av_value = si->si_ctxcsn[0];
 624                 /* If there are multiple CSNs, use the largest */
 625                 for ( i=1; i<si->si_numcsns; i++) {
 626                         if ( ber_bvcmp( &cf.f_av_value, &si->si_ctxcsn[i] ) < 0 ) {
 627                                 cf.f_av_value = si->si_ctxcsn[i];
 628                                 maxid = i;
 629                         }
 630                 }
 631                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 632                         cf.f_av_value.bv_val );
 633                 fop.ors_attrsonly = 0;
 634                 fop.ors_attrs = csn_anlist;
 635                 fop.ors_slimit = SLAP_NO_LIMIT;
 636                 cb.sc_private = &maxcsn;
 637                 cb.sc_response = findmax_cb;
 638                 strcpy( cbuf, cf.f_av_value.bv_val );
 639                 maxcsn.bv_val = cbuf;
 640                 maxcsn.bv_len = cf.f_av_value.bv_len;
 641                 break;
 642         case FIND_CSN:
 643                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 644                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 645                         /* If there are multiple CSNs, use the smallest */
 646                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 647                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 648                                         > 0 ) {
 649                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 650                                 }
 651                         }
 652                 }
 653                 /* Look for exact match the first time */
 654                 if ( findcsn_retry ) {
 655                         cf.f_choice = LDAP_FILTER_EQUALITY;
 656                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 657                                 cf.f_av_value.bv_val );
 658                 /* On retry, look for <= */
 659                 } else {
 660                         cf.f_choice = LDAP_FILTER_LE;
 661                         fop.ors_limit = &fc_limits;
 662                         fc_limits.lms_s_unchecked = 1;
 663                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 664                                 cf.f_av_value.bv_val );
 665                 }
 666                 fop.ors_attrsonly = 1;
 667                 fop.ors_attrs = slap_anlist_no_attrs;
 668                 fop.ors_slimit = 1;
 669                 cb.sc_private = NULL;
 670                 cb.sc_response = findcsn_cb;
 671                 break;
 672         case FIND_PRESENT:
 673                 fop.ors_filter = op->ors_filter;
 674                 fop.ors_filterstr = op->ors_filterstr;
 675                 fop.ors_attrsonly = 0;
 676                 fop.ors_attrs = uuid_anlist;
 677                 fop.ors_slimit = SLAP_NO_LIMIT;
 678                 cb.sc_private = &pcookie;
 679                 cb.sc_response = findpres_cb;
 680                 pcookie.num = 0;
 681
 682                 /* preallocate storage for a full set */
 683                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 684                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 685                         op->o_tmpmemctx );
 686                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 687                 pcookie.uuids[0].bv_val = pcookie.last;
 688                 pcookie.uuids[0].bv_len = UUID_LEN;
 689                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 690                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 691                         pcookie.uuids[i].bv_len = UUID_LEN;
 692                 }
 693                 break;
 694         }
 695
 696         fop.o_bd->bd_info = on->on_info->oi_orig;
 697         fop.o_bd->be_search( &fop, &frs );
 698         fop.o_bd->bd_info = (BackendInfo *)on;
 699
 700         switch( mode ) {
 701         case FIND_MAXCSN:
 702                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 703                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 704                         si->si_numops++;        /* ensure a checkpoint */
 705                 }
 706                 break;
 707         case FIND_CSN:
 708                 /* If matching CSN was not found, invalidate the context. */
 709                 if ( !cb.sc_private ) {
 710                         /* If we didn't find an exact match, then try for <= */
 711                         if ( findcsn_retry ) {
 712                                 findcsn_retry = 0;
 713                                 goto again;
 714                         }
 715                         rc = LDAP_NO_SUCH_OBJECT;
 716                 }
 717                 break;
 718         case FIND_PRESENT:
 719                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 720                 break;
 721         }
 722
 723         return rc;
 724 }
 725
 726 static void
 727 syncprov_free_syncop( syncops *so )
 728 {
 729         syncres *sr, *srnext;
 730         GroupAssertion *ga, *gnext;
 731
 732         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 733         if ( --so->s_inuse > 0 ) {
 734                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 735                 return;
 736         }
 737         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 738         if ( so->s_flags & PS_IS_DETACHED ) {
 739                 filter_free( so->s_op->ors_filter );
 740                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 741                         gnext = ga->ga_next;
 742                         ch_free( ga );
 743                 }
 744                 ch_free( so->s_op );
 745         }
 746         ch_free( so->s_base.bv_val );
 747         for ( sr=so->s_res; sr; sr=srnext ) {
 748                 srnext = sr->s_next;
 749                 ch_free( sr );
 750         }
 751         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 752         ch_free( so );
 753 }
 754
 755 /* Send a persistent search response */
 756 static int
 757 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 758         Entry **e, int mode )
 759 {
 760         slap_overinst *on = opc->son;
 761
 762         SlapReply rs = { REP_SEARCH };
 763         LDAPControl *ctrls[2];
 764         struct berval cookie, csns[2];
 765         Entry e_uuid = {0};
 766         Attribute a_uuid = {0};
 767
 768         if ( so->s_op->o_abandon )
 769                 return SLAPD_ABANDON;
 770
 771         ctrls[1] = NULL;
 772         csns[0] = opc->sctxcsn;
 773         BER_BVZERO( &csns[1] );
 774         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, so->s_sid );
 775
 776         e_uuid.e_attrs = &a_uuid;
 777         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 778         a_uuid.a_nvals = &opc->suuid;
 779         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 780                 mode, ctrls, 0, 1, &cookie );
 781         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 782
 783         rs.sr_ctrls = ctrls;
 784         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 785         switch( mode ) {
 786         case LDAP_SYNC_ADD:
 787                 rs.sr_entry = *e;
 788                 if ( rs.sr_entry->e_private )
 789                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 790                 if ( opc->sreference ) {
 791                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 792                         rs.sr_err = send_search_reference( op, &rs );
 793                         ber_bvarray_free( rs.sr_ref );
 794                         if ( !rs.sr_entry )
 795                                 *e = NULL;
 796                         break;
 797                 }
 798                 /* fallthru */
 799         case LDAP_SYNC_MODIFY:
 800                 rs.sr_entry = *e;
 801                 if ( rs.sr_entry->e_private )
 802                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 803                 rs.sr_attrs = op->ors_attrs;
 804                 rs.sr_err = send_search_entry( op, &rs );
 805                 if ( !rs.sr_entry )
 806                         *e = NULL;
 807                 break;
 808         case LDAP_SYNC_DELETE:
 809                 e_uuid.e_attrs = NULL;
 810                 e_uuid.e_name = opc->sdn;
 811                 e_uuid.e_nname = opc->sndn;
 812                 rs.sr_entry = &e_uuid;
 813                 if ( opc->sreference ) {
 814                         struct berval bv = BER_BVNULL;
 815                         rs.sr_ref = &bv;
 816                         rs.sr_err = send_search_reference( op, &rs );
 817                 } else {
 818                         rs.sr_err = send_search_entry( op, &rs );
 819                 }
 820                 break;
 821         default:
 822                 assert(0);
 823         }
 824         /* In case someone else freed it already? */
 825         if ( rs.sr_ctrls ) {
 826                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 827                 rs.sr_ctrls = NULL;
 828         }
 829
 830         return rs.sr_err;
 831 }
 832
 833 /* Play back queued responses */
 834 static int
 835 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 836 {
 837         syncres *sr;
 838         Entry *e;
 839         opcookie opc;
 840         int rc = 0;
 841
 842         opc.son = on;
 843
 844         for (;;) {
 845                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 846                 sr = so->s_res;
 847                 if ( sr )
 848                         so->s_res = sr->s_next;
 849                 if ( !so->s_res )
 850                         so->s_restail = NULL;
 851                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 852
 853                 if ( !sr || so->s_op->o_abandon )
 854                         break;
 855
 856                 opc.sdn = sr->s_dn;
 857                 opc.sndn = sr->s_ndn;
 858                 opc.suuid = sr->s_uuid;
 859                 opc.sctxcsn = sr->s_csn;
 860                 opc.sreference = sr->s_isreference;
 861                 e = NULL;
 862
 863                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 864                         rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 865                         if ( rc ) {
 866                                 Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 867                                         "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 868                                 ch_free( sr );
 869                                 rc = 0;
 870                                 continue;
 871                         }
 872                 }
 873                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 874
 875                 if ( e ) {
 876                         overlay_entry_release_ov( op, e, 0, on );
 877                 }
 878
 879                 ch_free( sr );
 880
 881                 if ( rc )
 882                         break;
 883         }
 884         return rc;
 885 }
 886
 887 /* runqueue task for playing back queued responses */
 888 static void *
 889 syncprov_qtask( void *ctx, void *arg )
 890 {
 891         struct re_s *rtask = arg;
 892         syncops *so = rtask->arg;
 893         slap_overinst *on = so->s_op->o_private;
 894         OperationBuffer opbuf;
 895         Operation *op;
 896         BackendDB be;
 897         int rc;
 898
 899         op = (Operation *) &opbuf;
 900         *op = *so->s_op;
 901         op->o_hdr = (Opheader *)(op+1);
 902         op->o_controls = (void **)(op->o_hdr+1);
 903         memset( op->o_controls, 0, SLAP_MAX_CIDS * sizeof(void *));
 904
 905         *op->o_hdr = *so->s_op->o_hdr;
 906
 907         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 908         op->o_tmpmfuncs = &slap_sl_mfuncs;
 909         op->o_threadctx = ctx;
 910
 911         /* syncprov_qplay expects a fake db */
 912         be = *so->s_op->o_bd;
 913         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 914         op->o_bd = &be;
 915         op->o_private = NULL;
 916         op->o_callback = NULL;
 917
 918         rc = syncprov_qplay( op, on, so );
 919
 920         /* decrement use count... */
 921         syncprov_free_syncop( so );
 922
 923         /* wait until we get explicitly scheduled again */
 924         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 925         ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
 926         if ( rc == 0 ) {
 927                 ldap_pvt_runqueue_resched( &slapd_rq, rtask, 1 );
 928         } else {
 929                 /* bail out on any error */
 930                 ldap_pvt_runqueue_remove( &slapd_rq, rtask );
 931         }
 932         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 933
 934 #if 0   /* FIXME: connection_close isn't exported from slapd.
 935                  * should it be?
 936                  */
 937         if ( rc ) {
 938                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 939                 if ( connection_state_closing( op->o_conn )) {
 940                         connection_close( op->o_conn );
 941                 }
 942                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 943         }
 944 #endif
 945         return NULL;
 946 }
 947
 948 /* Start the task to play back queued psearch responses */
 949 static void
 950 syncprov_qstart( syncops *so )
 951 {
 952         int wake=0;
 953         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 954         if ( !so->s_qtask ) {
 955                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 956                         syncprov_qtask, so, "syncprov_qtask",
 957                         so->s_op->o_conn->c_peer_name.bv_val );
 958                 ++so->s_inuse;
 959                 wake = 1;
 960         } else {
 961                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 962                         !so->s_qtask->next_sched.tv_sec ) {
 963                         so->s_qtask->interval.tv_sec = 0;
 964                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 965                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 966                         ++so->s_inuse;
 967                         wake = 1;
 968                 }
 969         }
 970         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 971         if ( wake )
 972                 slap_wake_listener();
 973 }
 974
 975 /* Queue a persistent search response */
 976 static int
 977 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 978 {
 979         syncres *sr;
 980         int sid;
 981
 982         /* Don't send changes back to their originator */
 983         sid = slap_parse_csn_sid( &opc->sctxcsn );
 984         if ( sid >= 0 && sid == so->s_sid )
 985                 return LDAP_SUCCESS;
 986
 987         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 988                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 989         sr->s_next = NULL;
 990         sr->s_dn.bv_val = (char *)(sr + 1);
 991         sr->s_dn.bv_len = opc->sdn.bv_len;
 992         sr->s_mode = mode;
 993         sr->s_isreference = opc->sreference;
 994         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
 995                  opc->sdn.bv_val ) + 1;
 996         sr->s_ndn.bv_len = opc->sndn.bv_len;
 997         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
 998                  opc->sndn.bv_val ) + 1;
 999         sr->s_uuid.bv_len = opc->suuid.bv_len;
1000         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1001         sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1002         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
1003         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
1004
1005         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1006         if ( !so->s_res ) {
1007                 so->s_res = sr;
1008         } else {
1009                 so->s_restail->s_next = sr;
1010         }
1011         so->s_restail = sr;
1012
1013         /* If the base of the psearch was modified, check it next time round */
1014         if ( so->s_flags & PS_WROTE_BASE ) {
1015                 so->s_flags ^= PS_WROTE_BASE;
1016                 so->s_flags |= PS_FIND_BASE;
1017         }
1018         if ( so->s_flags & PS_IS_DETACHED ) {
1019                 syncprov_qstart( so );
1020         }
1021         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1022         return LDAP_SUCCESS;
1023 }
1024
1025 static int
1026 syncprov_drop_psearch( syncops *so, int lock )
1027 {
1028         if ( so->s_flags & PS_IS_DETACHED ) {
1029                 if ( lock )
1030                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1031                 so->s_op->o_conn->c_n_ops_executing--;
1032                 so->s_op->o_conn->c_n_ops_completed++;
1033                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
1034                         o_next );
1035                 if ( lock )
1036                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1037         }
1038         syncprov_free_syncop( so );
1039
1040         return 0;
1041 }
1042
1043 static int
1044 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1045 {
1046         slap_callback *sc = op->o_callback;
1047         op->o_callback = sc->sc_next;
1048         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1049         op->o_tmpfree( sc, op->o_tmpmemctx );
1050         return 0;
1051 }
1052
1053 static int
1054 syncprov_op_abandon( Operation *op, SlapReply *rs )
1055 {
1056         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1057         syncprov_info_t         *si = on->on_bi.bi_private;
1058         syncops *so, *soprev;
1059
1060         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1061         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1062                 soprev=so, so=so->s_next ) {
1063                 if ( so->s_op->o_connid == op->o_connid &&
1064                         so->s_op->o_msgid == op->orn_msgid ) {
1065                                 so->s_op->o_abandon = 1;
1066                                 soprev->s_next = so->s_next;
1067                                 break;
1068                 }
1069         }
1070         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1071         if ( so ) {
1072                 /* Is this really a Cancel exop? */
1073                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1074                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1075                         rs->sr_err = LDAP_CANCELLED;
1076                         send_ldap_result( so->s_op, rs );
1077                         if ( so->s_flags & PS_IS_DETACHED ) {
1078                                 slap_callback *cb;
1079                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1080                                 cb->sc_cleanup = syncprov_ab_cleanup;
1081                                 cb->sc_next = op->o_callback;
1082                                 cb->sc_private = so;
1083                                 return SLAP_CB_CONTINUE;
1084                         }
1085                 }
1086                 syncprov_drop_psearch( so, 0 );
1087         }
1088         return SLAP_CB_CONTINUE;
1089 }
1090
1091 /* Find which persistent searches are affected by this operation */
1092 static void
1093 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1094 {
1095         slap_overinst *on = opc->son;
1096         syncprov_info_t         *si = on->on_bi.bi_private;
1097
1098         fbase_cookie fc;
1099         syncops *ss, *sprev, *snext;
1100         Entry *e = NULL;
1101         Attribute *a;
1102         int rc;
1103         struct berval newdn;
1104         int freefdn = 0;
1105         BackendDB *b0 = op->o_bd, db;
1106
1107         fc.fdn = &op->o_req_ndn;
1108         /* compute new DN */
1109         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1110                 struct berval pdn;
1111                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1112                 else dnParent( fc.fdn, &pdn );
1113                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1114                 fc.fdn = &newdn;
1115                 freefdn = 1;
1116         }
1117         if ( op->o_tag != LDAP_REQ_ADD ) {
1118                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1119                         db = *op->o_bd;
1120                         op->o_bd = &db;
1121                 }
1122                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1123                 /* If we're sending responses now, make a copy and unlock the DB */
1124                 if ( e && !saveit ) {
1125                         Entry *e2 = entry_dup( e );
1126                         overlay_entry_release_ov( op, e, 0, on );
1127                         e = e2;
1128                 }
1129                 if ( rc ) {
1130                         op->o_bd = b0;
1131                         return;
1132                 }
1133         } else {
1134                 e = op->ora_e;
1135         }
1136
1137         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1138                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1139                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1140                 opc->sreference = is_entry_referral( e );
1141                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1142                 if ( a )
1143                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1144         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1145                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1146                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1147                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1148                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1149         }
1150
1151         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1152         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1153                 sprev = ss, ss=snext)
1154         {
1155                 syncmatches *sm;
1156                 int found = 0;
1157
1158                 snext = ss->s_next;
1159                 /* validate base */
1160                 fc.fss = ss;
1161                 fc.fbase = 0;
1162                 fc.fscope = 0;
1163
1164                 /* If the base of the search is missing, signal a refresh */
1165                 rc = syncprov_findbase( op, &fc );
1166                 if ( rc != LDAP_SUCCESS ) {
1167                         SlapReply rs = {REP_RESULT};
1168                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1169                                 "search base has changed" );
1170                         sprev->s_next = snext;
1171                         syncprov_drop_psearch( ss, 1 );
1172                         ss = sprev;
1173                         continue;
1174                 }
1175
1176
1177                 /* If we're sending results now, look for this op in old matches */
1178                 if ( !saveit ) {
1179                         syncmatches *old;
1180
1181                         /* Did we modify the search base? */
1182                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1183                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1184                                 ss->s_flags |= PS_WROTE_BASE;
1185                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1186                         }
1187
1188                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1189                                 old=sm, sm=sm->sm_next ) {
1190                                 if ( sm->sm_op == ss ) {
1191                                         found = 1;
1192                                         old->sm_next = sm->sm_next;
1193                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1194                                         break;
1195                                 }
1196                         }
1197                 }
1198
1199                 /* check if current o_req_dn is in scope and matches filter */
1200                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1201                         LDAP_COMPARE_TRUE ) {
1202                         if ( saveit ) {
1203                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1204                                 sm->sm_next = opc->smatches;
1205                                 sm->sm_op = ss;
1206                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1207                                 ++ss->s_inuse;
1208                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1209                                 opc->smatches = sm;
1210                         } else {
1211                                 /* if found send UPDATE else send ADD */
1212                                 syncprov_qresp( opc, ss,
1213                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1214                         }
1215                 } else if ( !saveit && found ) {
1216                         /* send DELETE */
1217                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1218                 }
1219         }
1220         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1221
1222         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1223                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1224                         op->o_bd = &db;
1225                 }
1226                 overlay_entry_release_ov( op, e, 0, on );
1227                 op->o_bd = b0;
1228         }
1229         if ( freefdn ) {
1230                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1231         }
1232         op->o_bd = b0;
1233 }
1234
1235 static int
1236 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1237 {
1238         slap_callback *cb = op->o_callback;
1239         opcookie *opc = cb->sc_private;
1240         slap_overinst *on = opc->son;
1241         syncprov_info_t         *si = on->on_bi.bi_private;
1242         syncmatches *sm, *snext;
1243         modtarget *mt, mtdummy;
1244
1245         for (sm = opc->smatches; sm; sm=snext) {
1246                 snext = sm->sm_next;
1247                 syncprov_free_syncop( sm->sm_op );
1248                 op->o_tmpfree( sm, op->o_tmpmemctx );
1249         }
1250
1251         /* Remove op from lock table */
1252         mtdummy.mt_op = op;
1253         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1254         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1255         if ( mt ) {
1256                 modinst *mi = mt->mt_mods;
1257
1258                 /* If there are more, promote the next one */
1259                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1260                 if ( mi->mi_next ) {
1261                         mt->mt_mods = mi->mi_next;
1262                         mt->mt_op = mt->mt_mods->mi_op;
1263                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1264                 } else {
1265                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1266                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1267                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1268                         ch_free( mt );
1269                 }
1270         }
1271         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1272         if ( !BER_BVISNULL( &opc->suuid ))
1273                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1274         if ( !BER_BVISNULL( &opc->sndn ))
1275                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1276         if ( !BER_BVISNULL( &opc->sdn ))
1277                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1278         op->o_callback = cb->sc_next;
1279         op->o_tmpfree(cb, op->o_tmpmemctx);
1280
1281         return 0;
1282 }
1283
1284 static void
1285 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1286 {
1287     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1288         Modifications mod;
1289         Operation opm;
1290         SlapReply rsm = { 0 };
1291         slap_callback cb = {0};
1292
1293         mod.sml_values = si->si_ctxcsn;
1294         mod.sml_nvalues = NULL;
1295         mod.sml_desc = slap_schema.si_ad_contextCSN;
1296         mod.sml_op = LDAP_MOD_REPLACE;
1297         mod.sml_flags = 0;
1298         mod.sml_next = NULL;
1299
1300         cb.sc_response = slap_null_cb;
1301         opm = *op;
1302         opm.o_tag = LDAP_REQ_MODIFY;
1303         opm.o_callback = &cb;
1304         opm.orm_modlist = &mod;
1305         opm.orm_no_opattrs = 1;
1306         opm.o_req_dn = op->o_bd->be_suffix[0];
1307         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1308         opm.o_bd->bd_info = on->on_info->oi_orig;
1309         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1310         opm.o_bd->be_modify( &opm, &rsm );
1311         if ( mod.sml_next != NULL ) {
1312                 slap_mods_free( mod.sml_next, 1 );
1313         }
1314 }
1315
1316 static void
1317 syncprov_add_slog( Operation *op )
1318 {
1319         opcookie *opc = op->o_callback->sc_private;
1320         slap_overinst *on = opc->son;
1321         syncprov_info_t         *si = on->on_bi.bi_private;
1322         sessionlog *sl;
1323         slog_entry *se;
1324
1325         sl = si->si_logs;
1326         {
1327                 /* Allocate a record. UUIDs are not NUL-terminated. */
1328                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1329                         op->o_csn.bv_len + 1 );
1330                 se->se_next = NULL;
1331                 se->se_tag = op->o_tag;
1332
1333                 se->se_uuid.bv_val = (char *)(&se[1]);
1334                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1335                 se->se_uuid.bv_len = opc->suuid.bv_len;
1336
1337                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1338                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1339                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1340                 se->se_csn.bv_len = op->o_csn.bv_len;
1341                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1342
1343                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1344                 if ( sl->sl_head ) {
1345                         sl->sl_tail->se_next = se;
1346                 } else {
1347                         sl->sl_head = se;
1348                 }
1349                 sl->sl_tail = se;
1350                 sl->sl_num++;
1351                 while ( sl->sl_num > sl->sl_size ) {
1352                         se = sl->sl_head;
1353                         sl->sl_head = se->se_next;
1354                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1355                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1356                         ch_free( se );
1357                         sl->sl_num--;
1358                 }
1359                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1360         }
1361 }
1362
1363 /* Just set a flag if we found the matching entry */
1364 static int
1365 playlog_cb( Operation *op, SlapReply *rs )
1366 {
1367         if ( rs->sr_type == REP_SEARCH ) {
1368                 op->o_callback->sc_private = (void *)1;
1369         }
1370         return rs->sr_err;
1371 }
1372
1373 /* enter with sl->sl_mutex locked, release before returning */
1374 static void
1375 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1376         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1377 {
1378         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1379         slog_entry *se;
1380         int i, j, ndel, num, nmods, mmods;
1381         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1382         BerVarray uuids;
1383         struct berval delcsn[2];
1384
1385         if ( !sl->sl_num ) {
1386                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1387                 return;
1388         }
1389
1390         num = sl->sl_num;
1391         i = 0;
1392         nmods = 0;
1393
1394         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1395                 num * UUID_LEN, op->o_tmpmemctx );
1396         uuids[0].bv_val = (char *)(uuids + num + 1);
1397
1398         delcsn[0].bv_len = 0;
1399         delcsn[0].bv_val = cbuf;
1400         BER_BVZERO(&delcsn[1]);
1401
1402         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1403          * and everything else at the end. Do this first so we can
1404          * unlock the list mutex.
1405          */
1406         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1407                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1408         for ( se=sl->sl_head; se; se=se->se_next ) {
1409                 int k;
1410                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1411                 ndel = 1;
1412                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1413                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1414                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1415                                 break;
1416                         }
1417                 }
1418                 if ( ndel <= 0 ) {
1419                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1420                         continue;
1421                 }
1422                 ndel = 0;
1423                 for ( k=0; k<numcsns; k++ ) {
1424                         if ( se->se_sid == sids[k] ) {
1425                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1426                                 break;
1427                         }
1428                 }
1429                 if ( ndel > 0 ) {
1430                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1431                         break;
1432                 }
1433                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1434                         j = i;
1435                         i++;
1436                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1437                         delcsn[0].bv_len = se->se_csn.bv_len;
1438                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1439                 } else {
1440                         nmods++;
1441                         j = num - nmods;
1442                 }
1443                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1444                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1445                 uuids[j].bv_len = UUID_LEN;
1446         }
1447         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1448
1449         ndel = i;
1450
1451         /* Zero out unused slots */
1452         for ( i=ndel; i < num - nmods; i++ )
1453                 uuids[i].bv_len = 0;
1454
1455         /* Mods must be validated to see if they belong in this delete set.
1456          */
1457
1458         mmods = nmods;
1459         /* Strip any duplicates */
1460         for ( i=0; i<nmods; i++ ) {
1461                 for ( j=0; j<ndel; j++ ) {
1462                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1463                                 uuids[num - 1 - i].bv_len = 0;
1464                                 mmods --;
1465                                 break;
1466                         }
1467                 }
1468                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1469                 for ( j=0; j<i; j++ ) {
1470                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1471                                 uuids[num - 1 - i].bv_len = 0;
1472                                 mmods --;
1473                                 break;
1474                         }
1475                 }
1476         }
1477
1478         if ( mmods ) {
1479                 Operation fop;
1480                 SlapReply frs = { REP_RESULT };
1481                 int rc;
1482                 Filter mf, af;
1483 #ifdef LDAP_COMP_MATCH
1484                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1485 #else
1486                 AttributeAssertion eq;
1487 #endif
1488                 slap_callback cb = {0};
1489
1490                 fop = *op;
1491
1492                 fop.o_sync_mode = 0;
1493                 fop.o_callback = &cb;
1494                 fop.ors_limit = NULL;
1495                 fop.ors_tlimit = SLAP_NO_LIMIT;
1496                 fop.ors_attrs = slap_anlist_all_attributes;
1497                 fop.ors_attrsonly = 0;
1498                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1499
1500                 af.f_choice = LDAP_FILTER_AND;
1501                 af.f_next = NULL;
1502                 af.f_and = &mf;
1503                 mf.f_choice = LDAP_FILTER_EQUALITY;
1504                 mf.f_ava = &eq;
1505                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1506                 mf.f_next = fop.ors_filter;
1507
1508                 fop.ors_filter = &af;
1509
1510                 cb.sc_response = playlog_cb;
1511                 fop.o_bd->bd_info = on->on_info->oi_orig;
1512
1513                 for ( i=ndel; i<num; i++ ) {
1514                         if ( uuids[i].bv_len == 0 ) continue;
1515
1516                         mf.f_av_value = uuids[i];
1517                         cb.sc_private = NULL;
1518                         fop.ors_slimit = 1;
1519                         frs.sr_nentries = 0;
1520                         rc = fop.o_bd->be_search( &fop, &frs );
1521
1522                         /* If entry was not found, add to delete list */
1523                         if ( !cb.sc_private ) {
1524                                 uuids[ndel++] = uuids[i];
1525                         }
1526                 }
1527                 fop.o_bd->bd_info = (BackendInfo *)on;
1528         }
1529         if ( ndel ) {
1530                 struct berval cookie;
1531
1532                 slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1533                         srs->sr_state.sid );
1534                 uuids[ndel].bv_val = NULL;
1535                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, &cookie, 0, uuids, 1 );
1536                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1537         }
1538         op->o_tmpfree( uuids, op->o_tmpmemctx );
1539 }
1540
1541 static int
1542 syncprov_op_response( Operation *op, SlapReply *rs )
1543 {
1544         opcookie *opc = op->o_callback->sc_private;
1545         slap_overinst *on = opc->son;
1546         syncprov_info_t         *si = on->on_bi.bi_private;
1547         syncmatches *sm;
1548
1549         if ( rs->sr_err == LDAP_SUCCESS )
1550         {
1551                 struct berval maxcsn = BER_BVNULL;
1552                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1553                 int do_check = 0;
1554
1555                 /* Update our context CSN */
1556                 cbuf[0] = '\0';
1557                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1558                 slap_get_commit_csn( op, &maxcsn );
1559                 if ( !BER_BVISNULL( &maxcsn ) ) {
1560                         int i, sid;
1561                         strcpy( cbuf, maxcsn.bv_val );
1562                         sid = slap_parse_csn_sid( &maxcsn );
1563                         for ( i=0; i<si->si_numcsns; i++ ) {
1564                                 if ( sid == si->si_sids[i] ) {
1565                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1566                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1567                                         }
1568                                         break;
1569                                 }
1570                         }
1571                         /* It's a new SID for us */
1572                         if ( i == si->si_numcsns ) {
1573                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1574                                 si->si_numcsns++;
1575                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1576                                         sizeof(int));
1577                                 si->si_sids[i] = sid;
1578                         }
1579                 }
1580
1581                 /* Don't do any processing for consumer contextCSN updates */
1582                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1583                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1584                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1585                         return SLAP_CB_CONTINUE;
1586                 }
1587
1588                 si->si_numops++;
1589                 if ( si->si_chkops || si->si_chktime ) {
1590                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1591                                 do_check = 1;
1592                                 si->si_numops = 0;
1593                         }
1594                         if ( si->si_chktime &&
1595                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1596                                 do_check = 1;
1597                                 si->si_chklast = op->o_time;
1598                         }
1599                 }
1600                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1601
1602                 if ( do_check ) {
1603                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1604                         syncprov_checkpoint( op, rs, on );
1605                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1606                 }
1607
1608                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1609                 opc->sctxcsn.bv_val = cbuf;
1610
1611                 /* Handle any persistent searches */
1612                 if ( si->si_ops ) {
1613                         switch(op->o_tag) {
1614                         case LDAP_REQ_ADD:
1615                         case LDAP_REQ_MODIFY:
1616                         case LDAP_REQ_MODRDN:
1617                         case LDAP_REQ_EXTENDED:
1618                                 syncprov_matchops( op, opc, 0 );
1619                                 break;
1620                         case LDAP_REQ_DELETE:
1621                                 /* for each match in opc->smatches:
1622                                  *   send DELETE msg
1623                                  */
1624                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1625                                         if ( sm->sm_op->s_op->o_abandon )
1626                                                 continue;
1627                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1628                                 }
1629                                 break;
1630                         }
1631                 }
1632
1633                 /* Add any log records */
1634                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1635                         syncprov_add_slog( op );
1636                 }
1637
1638         }
1639         return SLAP_CB_CONTINUE;
1640 }
1641
1642 /* We don't use a subentry to store the context CSN any more.
1643  * We expose the current context CSN as an operational attribute
1644  * of the suffix entry.
1645  */
1646 static int
1647 syncprov_op_compare( Operation *op, SlapReply *rs )
1648 {
1649         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1650         syncprov_info_t         *si = on->on_bi.bi_private;
1651         int rc = SLAP_CB_CONTINUE;
1652
1653         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1654                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1655         {
1656                 Entry e = {0};
1657                 Attribute a = {0};
1658
1659                 e.e_name = op->o_bd->be_suffix[0];
1660                 e.e_nname = op->o_bd->be_nsuffix[0];
1661                 e.e_attrs = &a;
1662
1663                 a.a_desc = slap_schema.si_ad_contextCSN;
1664
1665                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1666
1667                 a.a_vals = si->si_ctxcsn;
1668                 a.a_nvals = a.a_vals;
1669
1670                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1671                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1672                 if ( ! rs->sr_err ) {
1673                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1674                         goto return_results;
1675                 }
1676
1677                 if ( get_assert( op ) &&
1678                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1679                 {
1680                         rs->sr_err = LDAP_ASSERTION_FAILED;
1681                         goto return_results;
1682                 }
1683
1684
1685                 rs->sr_err = LDAP_COMPARE_FALSE;
1686
1687                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1688                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1689                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1690                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1691                 {
1692                         rs->sr_err = LDAP_COMPARE_TRUE;
1693                 }
1694
1695 return_results:;
1696
1697                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1698
1699                 send_ldap_result( op, rs );
1700
1701                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1702                         rs->sr_err = LDAP_SUCCESS;
1703                 }
1704                 rc = rs->sr_err;
1705         }
1706
1707         return rc;
1708 }
1709
1710 static int
1711 syncprov_op_mod( Operation *op, SlapReply *rs )
1712 {
1713         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1714         syncprov_info_t         *si = on->on_bi.bi_private;
1715
1716         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1717                 sizeof(opcookie) +
1718                 (si->si_ops ? sizeof(modinst) : 0 ),
1719                 op->o_tmpmemctx);
1720         opcookie *opc = (opcookie *)(cb+1);
1721         opc->son = on;
1722         cb->sc_response = syncprov_op_response;
1723         cb->sc_cleanup = syncprov_op_cleanup;
1724         cb->sc_private = opc;
1725         cb->sc_next = op->o_callback;
1726         op->o_callback = cb;
1727
1728         /* If there are active persistent searches, lock this operation.
1729          * See seqmod.c for the locking logic on its own.
1730          */
1731         if ( si->si_ops ) {
1732                 modtarget *mt, mtdummy;
1733                 modinst *mi;
1734
1735                 mi = (modinst *)(opc+1);
1736                 mi->mi_op = op;
1737
1738                 /* See if we're already modifying this entry... */
1739                 mtdummy.mt_op = op;
1740                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1741                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1742                 if ( mt ) {
1743                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1744                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1745                         mt->mt_tail->mi_next = mi;
1746                         mt->mt_tail = mi;
1747                         /* wait for this op to get to head of list */
1748                         while ( mt->mt_mods != mi ) {
1749                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1750                                 ldap_pvt_thread_yield();
1751                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1752
1753                                 /* clean up if the caller is giving up */
1754                                 if ( op->o_abandon ) {
1755                                         modinst *m2;
1756                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1757                                                 m2 = m2->mi_next );
1758                                         m2->mi_next = mi->mi_next;
1759                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1760                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1761                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1762                                         return SLAPD_ABANDON;
1763                                 }
1764                         }
1765                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1766                 } else {
1767                         /* Record that we're modifying this entry now */
1768                         mt = ch_malloc( sizeof(modtarget) );
1769                         mt->mt_mods = mi;
1770                         mt->mt_tail = mi;
1771                         mt->mt_op = mi->mi_op;
1772                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1773                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1774                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1775                 }
1776         }
1777
1778         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1779                 syncprov_matchops( op, opc, 1 );
1780
1781         return SLAP_CB_CONTINUE;
1782 }
1783
1784 static int
1785 syncprov_op_extended( Operation *op, SlapReply *rs )
1786 {
1787         if ( exop_is_write( op ))
1788                 return syncprov_op_mod( op, rs );
1789
1790         return SLAP_CB_CONTINUE;
1791 }
1792
1793 typedef struct searchstate {
1794         slap_overinst *ss_on;
1795         syncops *ss_so;
1796         BerVarray ss_ctxcsn;
1797         int *ss_sids;
1798         int ss_numcsns;
1799         int ss_present;
1800 } searchstate;
1801
1802 static int
1803 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1804 {
1805         if ( rs->sr_ctrls ) {
1806                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1807                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1808                 rs->sr_ctrls = NULL;
1809         }
1810         return 0;
1811 }
1812
1813 static void
1814 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1815 {
1816         Operation *op2;
1817         int i, alen = 0;
1818         size_t size;
1819         char *ptr;
1820         GroupAssertion *g1, *g2;
1821
1822         /* count the search attrs */
1823         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1824                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1825         }
1826         /* Make a new copy of the operation */
1827         size = sizeof(Operation) + sizeof(Opheader) +
1828                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1829                 op->o_req_dn.bv_len + 1 +
1830                 op->o_req_ndn.bv_len + 1 +
1831                 op->o_ndn.bv_len + 1 +
1832                 so->s_filterstr.bv_len + 1;
1833         op2 = (Operation *)ch_calloc( 1, size );
1834         op2->o_hdr = (Opheader *)(op2+1);
1835
1836         /* Copy the fields we care about explicitly, leave the rest alone */
1837         *op2->o_hdr = *op->o_hdr;
1838         op2->o_tag = op->o_tag;
1839         op2->o_time = op->o_time;
1840         op2->o_bd = on->on_info->oi_origdb;
1841         op2->o_request = op->o_request;
1842         op2->o_private = on;
1843
1844         if ( i ) {
1845                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1846                 ptr = (char *)(op2->ors_attrs+i+1);
1847                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1848                         op2->ors_attrs[i] = op->ors_attrs[i];
1849                         op2->ors_attrs[i].an_name.bv_val = ptr;
1850                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1851                 }
1852                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1853         } else {
1854                 ptr = (char *)(op2->o_hdr + 1);
1855         }
1856         op2->o_authz = op->o_authz;
1857         op2->o_ndn.bv_val = ptr;
1858         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1859         op2->o_dn = op2->o_ndn;
1860         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1861         op2->o_req_dn.bv_val = ptr;
1862         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1863         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1864         op2->o_req_ndn.bv_val = ptr;
1865         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1866         op2->ors_filterstr.bv_val = ptr;
1867         strcpy( ptr, so->s_filterstr.bv_val );
1868         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1869
1870         /* Skip the AND/GE clause that we stuck on in front */
1871         if ( so->s_flags & PS_FIX_FILTER ) {
1872                 op2->ors_filter = op->ors_filter->f_and->f_next;
1873                 so->s_flags ^= PS_FIX_FILTER;
1874         } else {
1875                 op2->ors_filter = op->ors_filter;
1876         }
1877         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
1878         so->s_op = op2;
1879
1880         /* Copy any cached group ACLs individually */
1881         op2->o_groups = NULL;
1882         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1883                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1884                 *g2 = *g1;
1885                 strcpy( g2->ga_ndn, g1->ga_ndn );
1886                 g2->ga_next = op2->o_groups;
1887                 op2->o_groups = g2;
1888         }
1889         /* Don't allow any further group caching */
1890         op2->o_do_not_cache = 1;
1891
1892         /* Add op2 to conn so abandon will find us */
1893         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1894         op->o_conn->c_n_ops_executing++;
1895         op->o_conn->c_n_ops_completed--;
1896         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1897         so->s_flags |= PS_IS_DETACHED;
1898         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1899
1900         /* Prevent anyone else from trying to send a result for this op */
1901         op->o_abandon = 1;
1902 }
1903
1904 static int
1905 syncprov_search_response( Operation *op, SlapReply *rs )
1906 {
1907         searchstate *ss = op->o_callback->sc_private;
1908         slap_overinst *on = ss->ss_on;
1909         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1910
1911         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1912                 Attribute *a;
1913                 /* If we got a referral without a referral object, there's
1914                  * something missing that we cannot replicate. Just ignore it.
1915                  * The consumer will abort because we didn't send the expected
1916                  * control.
1917                  */
1918                 if ( !rs->sr_entry ) {
1919                         assert( rs->sr_entry != NULL );
1920                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1921                         return SLAP_CB_CONTINUE;
1922                 }
1923                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1924                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
1925                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
1926                 }
1927                 if ( a ) {
1928                         int i, sid;
1929                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
1930
1931                         /* Don't send changed entries back to the originator */
1932                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
1933                                 Debug( LDAP_DEBUG_SYNC,
1934                                         "Entry %s changed by peer, ignored\n",
1935                                         rs->sr_entry->e_name.bv_val, 0, 0 );
1936                                 return LDAP_SUCCESS;
1937                         }
1938                         /* Make sure entry is less than the snapshot'd contextCSN */
1939                         for ( i=0; i<ss->ss_numcsns; i++ ) {
1940                                 if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
1941                                         &ss->ss_ctxcsn[i] ) > 0 ) {
1942                                         Debug( LDAP_DEBUG_SYNC,
1943                                                 "Entry %s CSN %s greater than snapshot %s\n",
1944                                                 rs->sr_entry->e_name.bv_val,
1945                                                 a->a_nvals[0].bv_val,
1946                                                 ss->ss_ctxcsn[i].bv_val );
1947                                         return LDAP_SUCCESS;
1948                                 }
1949                         }
1950
1951                         /* Don't send old entries twice */
1952                         if ( srs->sr_state.ctxcsn ) {
1953                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
1954                                         if ( sid == srs->sr_state.sids[i] &&
1955                                                 ber_bvcmp( &a->a_nvals[0],
1956                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
1957                                                 Debug( LDAP_DEBUG_SYNC,
1958                                                         "Entry %s CSN %s older or equal to ctx %s\n",
1959                                                         rs->sr_entry->e_name.bv_val,
1960                                                         a->a_nvals[0].bv_val,
1961                                                         srs->sr_state.ctxcsn[i].bv_val );
1962                                                 return LDAP_SUCCESS;
1963                                         }
1964                                 }
1965                         }
1966                 }
1967                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1968                         op->o_tmpmemctx );
1969                 rs->sr_ctrls[1] = NULL;
1970                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1971                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1972         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1973                 struct berval cookie;
1974
1975                 slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
1976                         srs->sr_state.rid, srs->sr_state.sid );
1977
1978                 /* Is this a regular refresh? */
1979                 if ( !ss->ss_so ) {
1980                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1981                                 op->o_tmpmemctx );
1982                         rs->sr_ctrls[1] = NULL;
1983                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1984                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1985                                         LDAP_SYNC_REFRESH_DELETES );
1986                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1987                 } else {
1988                 /* It's RefreshAndPersist, transition to Persist phase */
1989                         syncprov_sendinfo( op, rs, ss->ss_present ?
1990                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1991                                 &cookie, 1, NULL, 0 );
1992                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1993
1994                         /* Detach this Op from frontend control */
1995                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1996
1997                         /* Turn off the refreshing flag */
1998                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1999
2000                         syncprov_detach_op( op, ss->ss_so, on );
2001
2002                         /* If there are queued responses, fire them off */
2003                         if ( ss->ss_so->s_res )
2004                                 syncprov_qstart( ss->ss_so );
2005                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2006
2007                         return LDAP_SUCCESS;
2008                 }
2009         }
2010
2011         return SLAP_CB_CONTINUE;
2012 }
2013
2014 static int
2015 syncprov_op_search( Operation *op, SlapReply *rs )
2016 {
2017         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2018         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2019         slap_callback   *cb;
2020         int gotstate = 0, nochange = 0, do_present;
2021         syncops *sop = NULL;
2022         searchstate *ss;
2023         sync_control *srs;
2024         BerVarray ctxcsn;
2025         int i, *sids, numcsns;
2026         struct berval mincsn;
2027
2028         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2029
2030         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2031                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2032                 return rs->sr_err;
2033         }
2034
2035         do_present = si->si_nopres ? 0 : 1;
2036
2037         srs = op->o_controls[slap_cids.sc_LDAPsync];
2038         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
2039
2040         /* If this is a persistent search, set it up right away */
2041         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2042                 syncops so = {0};
2043                 fbase_cookie fc;
2044                 opcookie opc;
2045                 slap_callback sc;
2046
2047                 fc.fss = &so;
2048                 fc.fbase = 0;
2049                 so.s_eid = NOID;
2050                 so.s_op = op;
2051                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2052                 /* syncprov_findbase expects to be called as a callback... */
2053                 sc.sc_private = &opc;
2054                 opc.son = on;
2055                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2056                 cb = op->o_callback;
2057                 op->o_callback = &sc;
2058                 rs->sr_err = syncprov_findbase( op, &fc );
2059                 op->o_callback = cb;
2060                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2061
2062                 if ( rs->sr_err != LDAP_SUCCESS ) {
2063                         send_ldap_result( op, rs );
2064                         return rs->sr_err;
2065                 }
2066                 sop = ch_malloc( sizeof( syncops ));
2067                 *sop = so;
2068                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2069                 sop->s_rid = srs->sr_state.rid;
2070                 sop->s_sid = srs->sr_state.sid;
2071                 sop->s_inuse = 1;
2072
2073                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2074                 sop->s_next = si->si_ops;
2075                 si->si_ops = sop;
2076                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2077         }
2078
2079         /* snapshot the ctxcsn */
2080         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2081         numcsns = si->si_numcsns;
2082         if ( numcsns ) {
2083                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2084                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2085                 for ( i=0; i<numcsns; i++ )
2086                         sids[i] = si->si_sids[i];
2087         } else {
2088                 ctxcsn = NULL;
2089                 sids = NULL;
2090         }
2091         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2092
2093         /* If we have a cookie, handle the PRESENT lookups */
2094         if ( srs->sr_state.ctxcsn ) {
2095                 sessionlog *sl;
2096                 int i, j;
2097
2098                 /* If we don't have any CSN of our own yet, pretend nothing
2099                  * has changed.
2100                  */
2101                 if ( !numcsns )
2102                         goto no_change;
2103
2104                 /* If there are SIDs we don't recognize in the cookie, drop them */
2105                 for (i=0; i<srs->sr_state.numcsns; ) {
2106                         for (j=0; j<numcsns; j++) {
2107                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2108                                         break;
2109                                 }
2110                         }
2111                         /* not found */
2112                         if ( j == numcsns ) {
2113                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2114                                 j = srs->sr_state.numcsns - 1;
2115                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2116                                 tmp.bv_len = 0;
2117                                 srs->sr_state.ctxcsn[j] = tmp;
2118                                 srs->sr_state.numcsns = j;
2119                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2120                                 continue;
2121                         }
2122                         i++;
2123                 }
2124
2125                 /* Find the smallest CSN */
2126                 mincsn = srs->sr_state.ctxcsn[0];
2127                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2128                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2129                                 mincsn = srs->sr_state.ctxcsn[i];
2130                 }
2131
2132                 /* If nothing has changed, shortcut it */
2133                 if ( srs->sr_state.numcsns == numcsns ) {
2134                         int i, j, changed = 0;
2135                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2136                                 for ( j=0; j<numcsns; j++ ) {
2137                                         if ( srs->sr_state.sids[i] != sids[j] )
2138                                                 continue;
2139                                         if ( !bvmatch( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ))
2140                                                 changed = 1;
2141                                         break;
2142                                 }
2143                                 if ( changed )
2144                                         break;
2145                         }
2146                         if ( !changed ) {
2147 no_change:              nochange = 1;
2148                                 if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2149                                         LDAPControl     *ctrls[2];
2150
2151                                         ctrls[0] = NULL;
2152                                         ctrls[1] = NULL;
2153                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2154                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2155                                         rs->sr_ctrls = ctrls;
2156                                         rs->sr_err = LDAP_SUCCESS;
2157                                         send_ldap_result( op, rs );
2158                                         rs->sr_ctrls = NULL;
2159                                         return rs->sr_err;
2160                                 }
2161                                 goto shortcut;
2162                         }
2163                 }
2164                 /* Do we have a sessionlog for this search? */
2165                 sl=si->si_logs;
2166                 if ( sl ) {
2167                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2168                         /* Are there any log entries, and is the consumer state
2169                          * present in the session log?
2170                          */
2171                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2172                                 do_present = 0;
2173                                 /* mutex is unlocked in playlog */
2174                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2175                         } else {
2176                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2177                         }
2178                 }
2179                 /* Is the CSN still present in the database? */
2180                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2181                         /* No, so a reload is required */
2182                         /* the 2.2 consumer doesn't send this hint */
2183                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2184                                 if ( ctxcsn )
2185                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2186                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2187                                 return rs->sr_err;
2188                         }
2189                 } else {
2190                         gotstate = 1;
2191                         /* If changed and doing Present lookup, send Present UUIDs */
2192                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2193                                 LDAP_SUCCESS ) {
2194                                 if ( ctxcsn )
2195                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2196                                 send_ldap_result( op, rs );
2197                                 return rs->sr_err;
2198                         }
2199                 }
2200         }
2201
2202 shortcut:
2203         /* Append CSN range to search filter, save original filter
2204          * for persistent search evaluation
2205          */
2206         if ( sop ) {
2207                 sop->s_filterstr= op->ors_filterstr;
2208         }
2209
2210         /* If something changed, find the changes */
2211         if ( gotstate && !nochange ) {
2212                 Filter *fand, *fava;
2213
2214                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2215                 fand->f_choice = LDAP_FILTER_AND;
2216                 fand->f_next = NULL;
2217                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2218                 fand->f_and = fava;
2219                 fava->f_choice = LDAP_FILTER_GE;
2220                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2221                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2222 #ifdef LDAP_COMP_MATCH
2223                 fava->f_ava->aa_cf = NULL;
2224 #endif
2225                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2226                 fava->f_next = op->ors_filter;
2227                 op->ors_filter = fand;
2228                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2229                 if ( sop )
2230                         sop->s_flags |= PS_FIX_FILTER;
2231         }
2232
2233         /* Let our callback add needed info to returned entries */
2234         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2235         ss = (searchstate *)(cb+1);
2236         ss->ss_on = on;
2237         ss->ss_so = sop;
2238         ss->ss_present = do_present;
2239         ss->ss_ctxcsn = ctxcsn;
2240         ss->ss_numcsns = numcsns;
2241         ss->ss_sids = sids;
2242         cb->sc_response = syncprov_search_response;
2243         cb->sc_cleanup = syncprov_search_cleanup;
2244         cb->sc_private = ss;
2245         cb->sc_next = op->o_callback;
2246         op->o_callback = cb;
2247
2248         /* If this is a persistent search and no changes were reported during
2249          * the refresh phase, just invoke the response callback to transition
2250          * us into persist phase
2251          */
2252         if ( nochange ) {
2253                 rs->sr_err = LDAP_SUCCESS;
2254                 rs->sr_nentries = 0;
2255                 send_ldap_result( op, rs );
2256                 return rs->sr_err;
2257         }
2258         return SLAP_CB_CONTINUE;
2259 }
2260
2261 static int
2262 syncprov_operational(
2263         Operation *op,
2264         SlapReply *rs )
2265 {
2266         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2267         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2268
2269         if ( rs->sr_entry &&
2270                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2271
2272                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2273                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2274                         Attribute *a, **ap = NULL;
2275
2276                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2277                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2278                                         break;
2279                         }
2280
2281                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2282                         if ( si->si_ctxcsn ) {
2283                                 if ( !a ) {
2284                                         for ( ap = &rs->sr_operational_attrs; *ap;
2285                                                 ap=&(*ap)->a_next );
2286
2287                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2288                                         *ap = a;
2289                                 }
2290
2291                                 if ( !ap ) {
2292                                         if ( !rs->sr_flags & REP_ENTRY_MODIFIABLE ) {
2293                                                 rs->sr_entry = entry_dup( rs->sr_entry );
2294                                                 rs->sr_flags |=
2295                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2296                                                 a = attr_find( rs->sr_entry->e_attrs,
2297                                                         slap_schema.si_ad_contextCSN );
2298                                         }
2299                                         free( a->a_vals );
2300                                 }
2301                                 ber_bvarray_dup_x( &a->a_vals, si->si_ctxcsn, NULL );
2302                                 a->a_nvals = a->a_vals;
2303                         }
2304                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2305                 }
2306         }
2307         return SLAP_CB_CONTINUE;
2308 }
2309
2310 enum {
2311         SP_CHKPT = 1,
2312         SP_SESSL,
2313         SP_NOPRES,
2314         SP_USEHINT
2315 };
2316
2317 static ConfigDriver sp_cf_gen;
2318
2319 static ConfigTable spcfg[] = {
2320         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2321                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2322                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2323                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2324         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2325                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2326                         "DESC 'Session log size in ops' "
2327                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2328         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2329                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2330                         "DESC 'Omit Present phase processing' "
2331                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2332         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2333                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2334                         "DESC 'Observe Reload Hint in Request control' "
2335                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2336         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2337 };
2338
2339 static ConfigOCs spocs[] = {
2340         { "( OLcfgOvOc:1.1 "
2341                 "NAME 'olcSyncProvConfig' "
2342                 "DESC 'SyncRepl Provider configuration' "
2343                 "SUP olcOverlayConfig "
2344                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2345                         Cft_Overlay, spcfg },
2346         { NULL, 0, NULL }
2347 };
2348
2349 static int
2350 sp_cf_gen(ConfigArgs *c)
2351 {
2352         slap_overinst           *on = (slap_overinst *)c->bi;
2353         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2354         int rc = 0;
2355
2356         if ( c->op == SLAP_CONFIG_EMIT ) {
2357                 switch ( c->type ) {
2358                 case SP_CHKPT:
2359                         if ( si->si_chkops || si->si_chktime ) {
2360                                 struct berval bv;
2361                                 bv.bv_len = sprintf( c->msg, "%d %d",
2362                                         si->si_chkops, si->si_chktime );
2363                                 bv.bv_val = c->msg;
2364                                 value_add_one( &c->rvalue_vals, &bv );
2365                         } else {
2366                                 rc = 1;
2367                         }
2368                         break;
2369                 case SP_SESSL:
2370                         if ( si->si_logs ) {
2371                                 c->value_int = si->si_logs->sl_size;
2372                         } else {
2373                                 rc = 1;
2374                         }
2375                         break;
2376                 case SP_NOPRES:
2377                         if ( si->si_nopres ) {
2378                                 c->value_int = 1;
2379                         } else {
2380                                 rc = 1;
2381                         }
2382                         break;
2383                 case SP_USEHINT:
2384                         if ( si->si_usehint ) {
2385                                 c->value_int = 1;
2386                         } else {
2387                                 rc = 1;
2388                         }
2389                         break;
2390                 }
2391                 return rc;
2392         } else if ( c->op == LDAP_MOD_DELETE ) {
2393                 switch ( c->type ) {
2394                 case SP_CHKPT:
2395                         si->si_chkops = 0;
2396                         si->si_chktime = 0;
2397                         break;
2398                 case SP_SESSL:
2399                         if ( si->si_logs )
2400                                 si->si_logs->sl_size = 0;
2401                         else
2402                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2403                         break;
2404                 case SP_NOPRES:
2405                         if ( si->si_nopres )
2406                                 si->si_nopres = 0;
2407                         else
2408                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2409                         break;
2410                 case SP_USEHINT:
2411                         if ( si->si_usehint )
2412                                 si->si_usehint = 0;
2413                         else
2414                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2415                         break;
2416                 }
2417                 return rc;
2418         }
2419         switch ( c->type ) {
2420         case SP_CHKPT:
2421                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2422                         snprintf( c->msg, sizeof( c->msg ), "%s unable to parse checkpoint ops # \"%s\"",
2423                                 c->argv[0], c->argv[1] );
2424                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2425                                 "%s: %s\n", c->log, c->msg, 0 );
2426                         return ARG_BAD_CONF;
2427                 }
2428                 if ( si->si_chkops <= 0 ) {
2429                         snprintf( c->msg, sizeof( c->msg ), "%s invalid checkpoint ops # \"%d\"",
2430                                 c->argv[0], si->si_chkops );
2431                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2432                                 "%s: %s\n", c->log, c->msg, 0 );
2433                         return ARG_BAD_CONF;
2434                 }
2435                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2436                         snprintf( c->msg, sizeof( c->msg ), "%s unable to parse checkpoint time \"%s\"",
2437                                 c->argv[0], c->argv[1] );
2438                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2439                                 "%s: %s\n", c->log, c->msg, 0 );
2440                         return ARG_BAD_CONF;
2441                 }
2442                 if ( si->si_chktime <= 0 ) {
2443                         snprintf( c->msg, sizeof( c->msg ), "%s invalid checkpoint time \"%d\"",
2444                                 c->argv[0], si->si_chkops );
2445                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2446                                 "%s: %s\n", c->log, c->msg, 0 );
2447                         return ARG_BAD_CONF;
2448                 }
2449                 si->si_chktime *= 60;
2450                 break;
2451         case SP_SESSL: {
2452                 sessionlog *sl;
2453                 int size = c->value_int;
2454
2455                 if ( size < 0 ) {
2456                         snprintf( c->msg, sizeof( c->msg ), "%s size %d is negative",
2457                                 c->argv[0], size );
2458                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2459                                 "%s: %s\n", c->log, c->msg, 0 );
2460                         return ARG_BAD_CONF;
2461                 }
2462                 sl = si->si_logs;
2463                 if ( !sl ) {
2464                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2465                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2466                         sl->sl_mincsn.bv_len = 0;
2467                         sl->sl_num = 0;
2468                         sl->sl_head = sl->sl_tail = NULL;
2469                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2470                         si->si_logs = sl;
2471                 }
2472                 sl->sl_size = size;
2473                 }
2474                 break;
2475         case SP_NOPRES:
2476                 si->si_nopres = c->value_int;
2477                 break;
2478         case SP_USEHINT:
2479                 si->si_usehint = c->value_int;
2480                 break;
2481         }
2482         return rc;
2483 }
2484
2485 /* ITS#3456 we cannot run this search on the main thread, must use a
2486  * child thread in order to insure we have a big enough stack.
2487  */
2488 static void *
2489 syncprov_db_otask(
2490         void *ptr
2491 )
2492 {
2493         syncprov_findcsn( ptr, FIND_MAXCSN );
2494         return NULL;
2495 }
2496
2497 /* Read any existing contextCSN from the underlying db.
2498  * Then search for any entries newer than that. If no value exists,
2499  * just generate it. Cache whatever result.
2500  */
2501 static int
2502 syncprov_db_open(
2503     BackendDB *be
2504 )
2505 {
2506         slap_overinst   *on = (slap_overinst *) be->bd_info;
2507         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2508
2509         Connection conn = { 0 };
2510         OperationBuffer opbuf = { 0 };
2511         Operation *op = (Operation *) &opbuf;
2512         Entry *e = NULL;
2513         Attribute *a;
2514         int rc;
2515         void *thrctx = NULL;
2516
2517         if ( !SLAP_LASTMOD( be )) {
2518                 Debug( LDAP_DEBUG_ANY,
2519                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2520                 return -1;
2521         }
2522
2523         if ( slapMode & SLAP_TOOL_MODE ) {
2524                 return 0;
2525         }
2526
2527         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2528         if ( rc ) {
2529                 return rc;
2530         }
2531
2532         thrctx = ldap_pvt_thread_pool_context();
2533         connection_fake_init( &conn, op, thrctx );
2534         op->o_bd = be;
2535         op->o_dn = be->be_rootdn;
2536         op->o_ndn = be->be_rootndn;
2537
2538         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2539                 slap_schema.si_ad_contextCSN, 0, &e, on );
2540
2541         if ( e ) {
2542                 ldap_pvt_thread_t tid;
2543
2544                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2545                 if ( a ) {
2546                         int i;
2547                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2548                         for ( i = 0; !BER_BVISNULL( &a->a_vals[i] ); i++ );
2549                         si->si_numcsns = i;
2550                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, i, NULL );
2551                 }
2552                 overlay_entry_release_ov( op, e, 0, on );
2553                 if ( si->si_ctxcsn ) {
2554                         op->o_req_dn = be->be_suffix[0];
2555                         op->o_req_ndn = be->be_nsuffix[0];
2556                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2557                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2558                         ldap_pvt_thread_join( tid, NULL );
2559                 }
2560         }
2561
2562         /* Didn't find a contextCSN, should we generate one? */
2563         if ( !si->si_ctxcsn ) {
2564                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2565                 struct berval csn;
2566
2567                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2568                 /* If we're also a consumer, then don't generate anything.
2569                  * Wait for our provider to send it to us, or for a local
2570                  * modify if we have multimaster.
2571                  */
2572                         goto out;
2573                 }
2574                 csn.bv_val = csnbuf;
2575                 csn.bv_len = sizeof( csnbuf );
2576                 slap_get_csn( op, &csn, 0 );
2577                 value_add_one( &si->si_ctxcsn, &csn );
2578                 si->si_numcsns = 1;
2579                 si->si_sids = ch_malloc( sizeof(int) );
2580                 si->si_sids[0] = slap_serverID;
2581
2582                 /* make sure we do a checkpoint on close */
2583                 si->si_numops++;
2584         }
2585
2586 out:
2587         op->o_bd->bd_info = (BackendInfo *)on;
2588         return 0;
2589 }
2590
2591 /* Write the current contextCSN into the underlying db.
2592  */
2593 static int
2594 syncprov_db_close(
2595     BackendDB *be
2596 )
2597 {
2598     slap_overinst   *on = (slap_overinst *) be->bd_info;
2599     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2600
2601         if ( slapMode & SLAP_TOOL_MODE ) {
2602                 return 0;
2603         }
2604         if ( si->si_numops ) {
2605                 Connection conn;
2606                 OperationBuffer opbuf;
2607                 Operation *op = (Operation *) &opbuf;
2608                 SlapReply rs = {REP_RESULT};
2609                 void *thrctx;
2610
2611                 thrctx = ldap_pvt_thread_pool_context();
2612                 connection_fake_init( &conn, op, thrctx );
2613                 op->o_bd = be;
2614                 op->o_dn = be->be_rootdn;
2615                 op->o_ndn = be->be_rootndn;
2616                 syncprov_checkpoint( op, &rs, on );
2617         }
2618
2619     return 0;
2620 }
2621
2622 static int
2623 syncprov_db_init(
2624         BackendDB *be
2625 )
2626 {
2627         slap_overinst   *on = (slap_overinst *)be->bd_info;
2628         syncprov_info_t *si;
2629
2630         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2631                 Debug( LDAP_DEBUG_ANY,
2632                         "syncprov must be instantiated within a database.\n",
2633                         0, 0, 0 );
2634                 return 1;
2635         }
2636
2637         si = ch_calloc(1, sizeof(syncprov_info_t));
2638         on->on_bi.bi_private = si;
2639         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2640         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2641         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2642
2643         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2644         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2645         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2646         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2647
2648         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2649         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2650
2651         return 0;
2652 }
2653
2654 static int
2655 syncprov_db_destroy(
2656         BackendDB *be
2657 )
2658 {
2659         slap_overinst   *on = (slap_overinst *)be->bd_info;
2660         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2661
2662         if ( si ) {
2663                 if ( si->si_logs ) {
2664                         slog_entry *se = si->si_logs->sl_head;
2665
2666                         while ( se ) {
2667                                 slog_entry *se_next = se->se_next;
2668                                 ch_free( se );
2669                                 se = se_next;
2670                         }
2671
2672                         ch_free( si->si_logs );
2673                 }
2674                 if ( si->si_ctxcsn )
2675                         ber_bvarray_free( si->si_ctxcsn );
2676                 if ( si->si_sids )
2677                         ch_free( si->si_sids );
2678                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2679                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2680                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2681                 ch_free( si );
2682         }
2683
2684         return 0;
2685 }
2686
2687 static int syncprov_parseCtrl (
2688         Operation *op,
2689         SlapReply *rs,
2690         LDAPControl *ctrl )
2691 {
2692         ber_tag_t tag;
2693         BerElementBuffer berbuf;
2694         BerElement *ber = (BerElement *)&berbuf;
2695         ber_int_t mode;
2696         ber_len_t len;
2697         struct berval cookie = BER_BVNULL;
2698         sync_control *sr;
2699         int rhint = 0;
2700
2701         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2702                 rs->sr_text = "Sync control specified multiple times";
2703                 return LDAP_PROTOCOL_ERROR;
2704         }
2705
2706         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2707                 rs->sr_text = "Sync control specified with pagedResults control";
2708                 return LDAP_PROTOCOL_ERROR;
2709         }
2710
2711         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2712                 rs->sr_text = "Sync control value is empty (or absent)";
2713                 return LDAP_PROTOCOL_ERROR;
2714         }
2715
2716         /* Parse the control value
2717          *      syncRequestValue ::= SEQUENCE {
2718          *              mode   ENUMERATED {
2719          *                      -- 0 unused
2720          *                      refreshOnly             (1),
2721          *                      -- 2 reserved
2722          *                      refreshAndPersist       (3)
2723          *              },
2724          *              cookie  syncCookie OPTIONAL
2725          *      }
2726          */
2727
2728         ber_init2( ber, &ctrl->ldctl_value, 0 );
2729
2730         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2731                 rs->sr_text = "Sync control : mode decoding error";
2732                 return LDAP_PROTOCOL_ERROR;
2733         }
2734
2735         switch( mode ) {
2736         case LDAP_SYNC_REFRESH_ONLY:
2737                 mode = SLAP_SYNC_REFRESH;
2738                 break;
2739         case LDAP_SYNC_REFRESH_AND_PERSIST:
2740                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2741                 break;
2742         default:
2743                 rs->sr_text = "Sync control : unknown update mode";
2744                 return LDAP_PROTOCOL_ERROR;
2745         }
2746
2747         tag = ber_peek_tag( ber, &len );
2748
2749         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2750                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2751                         rs->sr_text = "Sync control : cookie decoding error";
2752                         return LDAP_PROTOCOL_ERROR;
2753                 }
2754                 tag = ber_peek_tag( ber, &len );
2755         }
2756         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2757                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2758                         rs->sr_text = "Sync control : rhint decoding error";
2759                         return LDAP_PROTOCOL_ERROR;
2760                 }
2761         }
2762         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2763                         rs->sr_text = "Sync control : decoding error";
2764                         return LDAP_PROTOCOL_ERROR;
2765         }
2766         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2767         sr->sr_rhint = rhint;
2768         if (!BER_BVISNULL(&cookie)) {
2769                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2770                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2771                 if ( sr->sr_state.rid == -1 ) {
2772                         rs->sr_text = "Sync control : cookie parsing error";
2773                         return LDAP_PROTOCOL_ERROR;
2774                 }
2775         }
2776
2777         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2778
2779         op->o_sync = ctrl->ldctl_iscritical
2780                 ? SLAP_CONTROL_CRITICAL
2781                 : SLAP_CONTROL_NONCRITICAL;
2782
2783         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2784
2785         return LDAP_SUCCESS;
2786 }
2787
2788 /* This overlay is set up for dynamic loading via moduleload. For static
2789  * configuration, you'll need to arrange for the slap_overinst to be
2790  * initialized and registered by some other function inside slapd.
2791  */
2792
2793 static slap_overinst            syncprov;
2794
2795 int
2796 syncprov_initialize()
2797 {
2798         int rc;
2799
2800         rc = register_supported_control( LDAP_CONTROL_SYNC,
2801                 SLAP_CTRL_SEARCH, NULL,
2802                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2803         if ( rc != LDAP_SUCCESS ) {
2804                 Debug( LDAP_DEBUG_ANY,
2805                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2806                 return rc;
2807         }
2808
2809         syncprov.on_bi.bi_type = "syncprov";
2810         syncprov.on_bi.bi_db_init = syncprov_db_init;
2811         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2812         syncprov.on_bi.bi_db_open = syncprov_db_open;
2813         syncprov.on_bi.bi_db_close = syncprov_db_close;
2814
2815         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2816         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2817
2818         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2819         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2820         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2821         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2822         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2823         syncprov.on_bi.bi_op_search = syncprov_op_search;
2824         syncprov.on_bi.bi_extended = syncprov_op_extended;
2825         syncprov.on_bi.bi_operational = syncprov_operational;
2826
2827         syncprov.on_bi.bi_cf_ocs = spocs;
2828
2829         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2830
2831         rc = config_register_schema( spcfg, spocs );
2832         if ( rc ) return rc;
2833
2834         return overlay_register( &syncprov );
2835 }
2836
2837 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2838 int
2839 init_module( int argc, char *argv[] )
2840 {
2841         return syncprov_initialize();
2842 }
2843 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2844
2845 #endif /* defined(SLAPD_OVER_SYNCPROV) */